Revert "msm: msm_fb: Map RGB layers to the max possible size."

This reverts commit 1393288d14f8779f560e97832c226fa286ccd23b

Change-Id: I4ce2743fcc2444256b3a35b100df7228c00caf8c
Merge "Revert "msm: msm_fb: Map RGB layers to the max possible size.""