ARM: dts: sa2150p-nand: disable nodes for graphics support not needed

Auto products based on sa2150p-nand do not use graphic features
therefore device tree nodes have been disabled.

Change-Id: Ib205f719caddf178a415e05f83e70294df0e1b3c
Signed-off-by: Deepak Dimri <ddimri@codeaurora.org>