sh: Add Renesas rsk7264 board

The rsk7264 (also know as rsk2+sh7264) is an SH2A based board
with 64MB NAND flash and 64MB SDRAM. It is very similar to the
rsk7203 board.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/boards.cfg b/boards.cfg
index 6827cf3..c253f03 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -868,6 +868,7 @@
 xilinx-ppc440-generic        powerpc     ppc4xx      ppc440-generic      xilinx         -           xilinx-ppc440-generic:SYS_TEXT_BASE=0x04000000,RESET_VECTOR_ADDRESS=0x04100000,BOOT_FROM_XMD=1
 xilinx-ppc440-generic_flash  powerpc     ppc4xx      ppc440-generic      xilinx         -           xilinx-ppc440-generic:SYS_TEXT_BASE=0xF7F60000,RESET_VECTOR_ADDRESS=0xF7FFFFFC
 rsk7203                      sh          sh2         rsk7203             renesas        -
+rsk7264                      sh          sh2         rsk7264             renesas        -
 mpr2                         sh          sh3         mpr2                -              -
 ms7720se                     sh          sh3         ms7720se            -              -
 shmin                        sh          sh3         shmin               -              -