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/MAINTAINERS b/MAINTAINERS
index 85ba8d2..f99eae5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17,6 +17,10 @@
 #	Board		CPU						#
 #########################################################################
 
+Poonam Aggrwal <poonam.aggrwal@freescale.com>
+
+	P2020RDB	P2020
+
 Greg Allen <gallen@arlut.utexas.edu>
 
 	UTX8245		MPC8245