85xx/p1_p2rdb: Fix crash while configuring 32 bit DDR i/f for P1020RDB.

The data being modified was in NOR flash which caused the crash.

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>