Add more plumbing for translating 10-bit BGRA into skia

Bug: 414794424
Flag: com.android.graphics.hwui.flags.requested_formats_bgra_1010102
Test: Hacking up a device that normally swizzles RGBA1010102 for
readback to not swizzle produces a correct image when telling skia it's
a BGRA1010102 image for PNG encoding

Change-Id: Ibe702a533e7f51adbefbced9897ae75ed0933899