sh: Add SH7269 device and RSK2+SH7269 board

This is an sh2a device (max 266MHz) with FPU, video display
controller (VDC), 8 serial ports, 4 I2C channels, 3 CAN ports,
SD and on-chip USB.

The RSK2+SH7269 board uses the SH7269 processor. It is often
referred to as just rsk7269.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/boards.cfg b/boards.cfg
index d21eae5..9ef903a 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -1013,6 +1013,7 @@
 sandbox                      sandbox     sandbox     sandbox             sandbox        -
 rsk7203                      sh          sh2         rsk7203             renesas        -
 rsk7264                      sh          sh2         rsk7264             renesas        -
+rsk7269                      sh          sh2         rsk7269             renesas        -
 mpr2                         sh          sh3         mpr2                -              -
 ms7720se                     sh          sh3         ms7720se            -              -
 shmin                        sh          sh3         shmin               -              -