Stop calling SkBitmap::setHasHardwareMipMap

Test: mmma -j frameworks/base/libs/hwui
      mmma -j frameworks/base/core/jni/

No one ever calls SkBitmap::hasHardwareMipMap, so there is no reason to
set it.

Change-Id: I5f7aec5353fbb38c83ef7f66e14f65f1a560558f