All texture access in Vulkan is through descriptors. We don't need any
of the context-side state for this.

Bug: b/125909515
Change-Id: I7d0846d2fdcc03504e2dd3f44580fb5c09188c1a
Reviewed-on: https://swiftshader-review.googlesource.com/c/25331Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>