[Graphite] Enable VK_EXT_pipeline_protected_access

This enabled its usage if we see the extension exists or we are using
Vulkan 1.4 and see protectedMemory is supported. It is then used
whenever creating graphics pipelines if available.

Change-Id: I2144138c3a09b7f84d21008038a568dd13736a13
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1379837
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Nathan Sanchez <nathanasanchez@google.com>