ppc/85xx: Simplify the top makefile for P1_P2_RDB boards

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/Makefile b/Makefile
index 1e25669..d8daa89 100644
--- a/Makefile
+++ b/Makefile
@@ -2520,25 +2520,11 @@
 P2020DS_config:		unconfig
 	@$(MKCONFIG) -t $(@:_config=) P2020DS ppc mpc85xx p2020ds freescale
 
-P1011RDB_config:	unconfig
-	@mkdir -p $(obj)include
-	@echo "#define CONFIG_P1011" >>$(obj)include/config.h ;
-	@$(MKCONFIG) -a P1_P2_RDB  ppc mpc85xx p1_p2_rdb freescale
-
-P1020RDB_config:	unconfig
-	@mkdir -p $(obj)include
-	@echo "#define CONFIG_P1020" >>$(obj)include/config.h ;
-	@$(MKCONFIG) -a P1_P2_RDB  ppc mpc85xx p1_p2_rdb freescale
-
-P2010RDB_config:	unconfig
-	@mkdir -p $(obj)include
-	@echo "#define CONFIG_P2010" >>$(obj)include/config.h ;
-	@$(MKCONFIG) -a P1_P2_RDB  ppc mpc85xx p1_p2_rdb freescale
-
+P1011RDB_config	\
+P1020RDB_config	\
+P2010RDB_config \
 P2020RDB_config:	unconfig
-	@mkdir -p $(obj)include
-	@echo "#define CONFIG_P2020" >>$(obj)include/config.h ;
-	@$(MKCONFIG) -a P1_P2_RDB  ppc mpc85xx p1_p2_rdb freescale
+	@$(MKCONFIG) -t $(@:_config=) P1_P2_RDB ppc mpc85xx p1_p2_rdb freescale
 
 PM854_config:	unconfig
 	@$(MKCONFIG) $(@:_config=) ppc mpc85xx pm854