Rename GrColorType::kRGB_565 to kBGR_565

All our other color types put the low bits as the first component in the
name. For 565 B is the low bits and R is the high bits so the name is being
updated to reflect that.

Bug: skia:9170
Change-Id: I67be32440d6c6fa8a345532fe144720d23cf340a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/221337
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
6 files changed