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/MAKEALL b/MAKEALL
index 65cd6d0..6634f09 100755
--- a/MAKEALL
+++ b/MAKEALL
@@ -391,6 +391,7 @@
 	MPC8572DS_36BIT	\
 	P2020DS		\
 	P2020DS_36BIT	\
+	P2020RDB	\
 	PM854		\
 	PM856		\
 	sbc8540		\