Use ANDROID_NATIVE_UNSIGNED_CAST() in GraphicBufferMapper::lockAsync() and...

Use ANDROID_NATIVE_UNSIGNED_CAST() in GraphicBufferMapper::lockAsync() and GraphicBuffer::lockAsync()

If bit 31 of the return value of android_convertGralloc1To0Usage() is 1,
the high 32 bits of "usage" is all 1.
To fix, add ANDROID_NATIVE_UNSIGNED_CAST().

Change-Id: Ie8fe138e4626a179284f079d728e1fd14d83b130
Signed-off-by: Fang Hui <hui.fang@nxp.com>