sh: Add support T-SH7706LSR board

This patch supports T-SH7706LSR board.
This is constitution almost same as shmin (T-SH7706LAN).
Therefore, most functions work by a change of the setting of config.

http://web.kyoto-inet.or.jp/people/takagaki/T-SH7706/T-SH7706LSR.htm

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/board/shmin/config.mk b/board/shmin/config.mk
index eca20d4..0c7605e 100644
--- a/board/shmin/config.mk
+++ b/board/shmin/config.mk
@@ -24,4 +24,4 @@
 # NOTE: Must match value used in u-boot.lds (in this directory).
 #
 
-CONFIG_SYS_TEXT_BASE = 0x8DFC0000
+CONFIG_SYS_TEXT_BASE = 0x8DFB0000