Revert "gralloc: Override gralloc calculated size only if bufferSize is greater."

Causes corrupt preview for 480p mode on 7x30.

This reverts commit 81a5e0e855858a4fb44fd1fe20c74d9ea7390a08.
Revert part of the gralloc override buffer only if greater commit - seems to help video playback

Change-Id: I35f71126133e167c040ec4d99f1211e5bf6311d7