Add BitmapFactory.Options.inColorSpace

This allows applications to load bitmap in a preferred
target color space, similar to inPreferredConfig for
configurations.

This change also applies recent changes made to BitmapFactory
to BitmapRegionDecoder: support for outColorSpace, inColorSpace
and outConfig.

Bug: 32984164, 36905374
Test: CtsGraphicsTestCase (BitmapColorSpaceTest/BitmapRegionDecoderTest)
Change-Id: I4eded9190d1aa9c7f3033f9bb78a6854cc48a3ef