sh: Add support for AP-SH4A-4A board

The AP-SH4A-4A board has SH7734, 64MB DDR2-SDRAM, USB,
Ethernet, and more.

This patch supports the following functions:
  - 64MB DDR2-SDRAM
  - 16MB NOR Flash memory
  - Serial console (SCIF)
  - Ethernet (SH-Ether with Gigabit)
  - I2C

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index f3a84f6..17befd0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1103,6 +1103,7 @@
 	SHMIN		SH7706
 	ECOVEC		SH7724
 	R0P7734     SH7734
+	AP_SH4A_4A  SH7734
 
 Mark Jonas <mark.jonas@de.bosch.com>