sh: add support for sh7752evb board

The R0P7752C00000RZ board has SH7752, 512MB DDR3-SDRAM, SPI ROM,
Gigabit Ethernet, and eMMC.

This patch supports the following functions:
 - 512MB DDR3-SDRAM, SCIF4, SPI ROM, Gigabit Ethernet, eMMC

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index b24ba19..2fc81cf 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1202,6 +1202,7 @@
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
 
 	MS7720SE	SH7720
+	R0P77520000RZ	SH7752
 	R0P77570030RL	SH7757
 	R0P77850011RL	SH7785