xilinx: Add new Zynq board

Add support for Xilinx Zynq board.

Signed-off-by: Michal Simek <monstr@monstr.eu>
Acked-by: Marek Vasut <marex@denx.de>
CC: Joe Hershberger <joe.hershberger@gmail.com>
diff --git a/boards.cfg b/boards.cfg
index 5eb35c9..3a2cf32 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -280,6 +280,7 @@
 snowball                     arm         armv7       snowball               st-ericsson    u8500
 kzm9g                        arm         armv7       kzm9g               kmc            rmobile
 armadillo-800eva             arm         armv7       armadillo-800eva    atmark-techno  rmobile
+zynq                         arm         armv7       zynq                xilinx         zynq
 actux1_4_16                  arm         ixp         actux1              -              -           actux1:FLASH2X2
 actux1_4_32                  arm         ixp         actux1              -              -           actux1:FLASH2X2,RAM_32MB
 actux1_8_16                  arm         ixp         actux1              -              -           actux1:FLASH1X8