Change maintainer for Avionic Design boards

I no longer work for Avionic Design and don't have access to hardware,
so I'll pass on maintainership to Alban.

Acked-by: Alban Bedel <alban.bedel@avionic-design.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/boards.cfg b/boards.cfg
index b662149..c99d648 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -359,9 +359,9 @@
 Active  arm         armv7          zynq        xilinx          zynq                zynq                                 -                                                                                                                                 Michal Simek <monstr@monstr.eu>
 Active  arm         armv7          zynq        xilinx          zynq                zynq_dcc                             zynq:ZYNQ_DCC                                                                                                                     Michal Simek <monstr@monstr.eu>
 Active  arm         armv7:arm720t  tegra114    nvidia          dalmore             dalmore                              -                                                                                                                                 Tom Warren <twarren@nvidia.com>
-Active  arm         armv7:arm720t  tegra20     avionic-design  medcom-wide         medcom-wide                          -                                                                                                                                 Thierry Reding <thierry.reding@avionic-design.de>
-Active  arm         armv7:arm720t  tegra20     avionic-design  plutux              plutux                               -                                                                                                                                 Thierry Reding <thierry.reding@avionic-design.de>
-Active  arm         armv7:arm720t  tegra20     avionic-design  tec                 tec                                  -                                                                                                                                 Thierry Reding <thierry.reding@avionic-design.de>
+Active  arm         armv7:arm720t  tegra20     avionic-design  medcom-wide         medcom-wide                          -                                                                                                                                 Alban Bedel <alban.bedel@avionic-design.de>
+Active  arm         armv7:arm720t  tegra20     avionic-design  plutux              plutux                               -                                                                                                                                 Alban Bedel <alban.bedel@avionic-design.de>
+Active  arm         armv7:arm720t  tegra20     avionic-design  tec                 tec                                  -                                                                                                                                 Alban Bedel <alban.bedel@avionic-design.de>
 Active  arm         armv7:arm720t  tegra20     compal          paz00               paz00                                -                                                                                                                                 Tom Warren <twarren@nvidia.com>:Stephen Warren <swarren@nvidia.com>
 Active  arm         armv7:arm720t  tegra20     compulab        trimslice           trimslice                            -                                                                                                                                 Tom Warren <twarren@nvidia.com>:Stephen Warren <swarren@nvidia.com>
 Active  arm         armv7:arm720t  tegra20     nvidia          harmony             harmony                              -                                                                                                                                 Tom Warren <twarren@nvidia.com>