Don't set premultiplied alpha for msm7x27 platform

Change-Id: I2616ce7462cf4d7302fbbb5ac844df9c3229b8de
Disabled usage of COPYBIT_PREMULTIPLIED_ALPHA for MSM72227 as it is unsupported

Change-Id: Ibdcf43e3343ac63b7bfbc415479f2664f7b381af