Fix up readPixels, writePixels, and copies when dealing with ycbcr textures in vulkan.

In general this makes sure we never directly read or write pixels or use one of
the vk image copy functions if we are dealing with a VkImage that requires a Ycbcr texture.

Bug: b/129037735
Change-Id: Ib3bbac8bcddb643942e08d2b2ae3381fda6758a7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/203388
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
3 files changed