redo ifdefs for vectorizing Bitmap operations

Revert "frameworks/base: vectorize Bitmap operations"

This reverts commit 82ecb534d3e30684a6055523da0f705881755854.

frameworks/base: vectorize Bitmap operations

Enable gcc vectorizing optimizations for Bitmap operations within
libandroid_runtime.so.  Adds -ftree-vectorize -mvectorize-with-neon-quad
-fprefetch-loop-arrays to functions and compiles Bitmap.cpp in ARM mode
(necessary to enable vectorizing optimizations) for appropriate targets.

Change-Id: I12defef6f47adf41af849df6e750097f5906d92d

Conflicts:
	core/jni/Android.mk