Vectorize bitmap operations on A15 too

 * Commit a2e20761b5ad646ce3f08ed24995799dd81acee0 enables GCC
   vectorization for bitmap operations on Krait. Enable it on A15 also.

Change-Id: I1f733f5311376deb78782931ea2b83a8d12c2171
LockscreenPattern : missing public @hide

Change-Id: Ia2a22154352fc080db6e96666a4a0bef241c787b