[vulkan] Apply RelaxedPrecision to OpImageSampleImplicitLod

Including a workaround for Nvidia drivers that fail to create the
pipeline when the sampled image is YCbCr.

Bug: skia:421927604
Change-Id: I60320fcc70a949c603a56c59c1646467589cc899
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1003661
Commit-Queue: Shahbaz Youssefi <syoussefi@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
17 files changed