sh: Add support 32-Bit Extended Address Mode to sh7785lcr

We can built 'make sh7785lcr_32bit_config'. And add new command "pmb"
for this mode. This command changes PMB for using 512MB system memory.

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/board/renesas/sh7785lcr/config.mk b/board/renesas/sh7785lcr/config.mk
index 20807df..66d35cb 100644
--- a/board/renesas/sh7785lcr/config.mk
+++ b/board/renesas/sh7785lcr/config.mk
@@ -22,4 +22,8 @@
 #
 # NOTE: Must match value used in u-boot.lds (in this directory).
 #
+sinclude $(OBJTREE)/board/$(BOARDDIR)/config.tmp
+
+ifndef TEXT_BASE
 TEXT_BASE = 0x0ff80000
+endif