sh: MigoR: Moved MigoR board to board/renesas

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

Makefile

@@ -3144,7 +3144,7 @@ ms7720se_config: unconfig
 MigoR_config :       unconfig
 	@mkdir -p $(obj)include
 	@echo "#define CONFIG_MIGO_R 1" > $(obj)include/config.h
-	@./mkconfig -a $(@:_config=) sh sh4 MigoR
+	@./mkconfig -a $(@:_config=) sh sh4 MigoR renesas
 
 ms7750se_config: unconfig
 	@mkdir -p $(obj)include