Remove uses of sk_sp when passing around GrVkPipelineState

There is no need to be passing ref's around when we get a GrVkPipelineState
from the cache. We don't track its use on the GPU and we never delete
them from the cache until we are destorying the GrVkGpu object.

Bug: skia:
Change-Id: If675ce9e0690b36663f6d227c48fd4874ba46770
Reviewed-on: https://skia-review.googlesource.com/59985
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
5 files changed