correctly set gralloc usage and remove memset workaround

Correct gralloc usage together with correct lock area trigger cache
flushing correctly, to resolve corruption during resolution change.
The memset workaround for Bug 19197299 is also removed since we didn't
observe it on DDK-1.5.

Bug: 22183821

Change-Id: If1c112988a300b7aa9054127aa37cc2cf50d5371
Signed-off-by: Tianmi Chen <tianmi.chen@intel.com>
1 file changed