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/boards.cfg b/boards.cfg
index 35f38f3..1d042ec 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -1089,6 +1089,7 @@
 MigoR                        sh          sh4         MigoR               renesas        -
 r2dplus                      sh          sh4         r2dplus             renesas        -
 r7780mp                      sh          sh4         r7780mp             renesas        -
+sh7752evb                    sh          sh4         sh7752evb           renesas        -
 sh7757lcr                    sh          sh4         sh7757lcr           renesas        -
 sh7763rdp                    sh          sh4         sh7763rdp           renesas        -
 sh7785lcr                    sh          sh4         sh7785lcr           renesas        -