sh: rsk7203: Move to boards.cfg

Move the rsk7203 target out of the Makefile and into boards.cfg.
And fix sh2 of MAKEALL.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/boards.cfg b/boards.cfg
index 0f3292f..2599c2a 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -732,5 +732,6 @@
 davinci_schmoogie arm	arm926ejs	schmoogie	davinci		davinci
 davinci_dm355leopard arm arm926ejs	dm355leopard	davinci		davinci
 bf527-ad7160-eval blackfin	blackfin
+rsk7203	sh	sh2		rsk7203		renesas		-
 # Target	ARCH	CPU		Board name	Vendor		SoC		Options
 ###############################################################################################