input: Add option to toggle pointer icon when using stylus

* The visible pointer icon when hovering or drawing with the stylus is
  quite annoying when trying to actually draw with it. Turn it off by
  default and add an option to turn it on.

Change-Id: Ib7f23e8b69589e3f875d150caf05065b64676e44

Conflicts:
	services/input/InputReader.cpp
	services/input/InputReader.h
	services/jni/com_android_server_input_InputManagerService.cpp

switch to boolean functions and simplified logic...
SystemUI: set correct initial NFC toggle state

Change-Id: I451f53bb2ae533823c214a66d83ce6a92ceb5025
Signed-off-by: Roman Birg <romanbirg@gmail.com>
SystemUI: avoid NPE when no toggles are set

Change-Id: Idc3fe5b43f545fed51f33b06fb5888fb5e226b7a
Signed-off-by: Roman Birg <romanbirg@gmail.com>
Vectorize bitmap operations on A15 too

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

Change-Id: I1f733f5311376deb78782931ea2b83a8d12c2171
core/jni/android/graphics: Cache copy of pre-scaled Bitmaps

Caching some pre-scaled Bitmap objects allows for optimizing later
scaling operations to reduce memory pressure.

CRs-fixed: 451681

Change-Id: Id4341e75911074ff9f565b2d386ccad8f3a223e8