85xx: Add support for P2020RDB board

The code base adds P1 & P2 RDB platforms support.
The folder and file names can cater to future SOCs of P1/P2 family.
P1 & P2 processors are 85xx platforms, part of Freescale QorIQ series.

Tested following on P2020RDB:
1. eTSECs
2. DDR, NAND, NOR, I2C.

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/Makefile b/Makefile
index c24df6b..b1095e8 100644
--- a/Makefile
+++ b/Makefile
@@ -2528,6 +2528,11 @@
 	fi
 	@$(MKCONFIG) -a P2020DS ppc mpc85xx p2020ds freescale
 
+P2020RDB_config:	unconfig
+	@mkdir -p $(obj)include
+	@echo "#define CONFIG_P2020" >>$(obj)include/config.h ;
+	@$(MKCONFIG) -a P1_P2_RDB  ppc mpc85xx p1_p2_rdb freescale
+
 PM854_config:	unconfig
 	@$(MKCONFIG) $(@:_config=) ppc mpc85xx pm854