Fallback to RGBA_8888 when P010 is not supported

It's possible that a TV does not support P010, which means
the TV is not able to decode 10-bit HEIF to RGBA_1010102.
In this case, falling back to output RGBA_8888 is necessary.

Bug: 276879147
Test: atest BitmapFactory#testDecode10BitHEIF10BitBitmap
      atest ImageDecoderTest#testDecode10BitHeif
Change-Id: I33f7f30cbee0080dc81764c73428dcac3c75ce88