Previously we were using the layout from the pipeline, but that doesn't
work if the pipeline is not bound yet. Conveniently, BindDescriptorSets
is passed a pipeline pointer by the app for this reason.

Bug: b/123244275
Test: dEQP-VK.binding_model.descriptorset_random.sets4.*
Change-Id: I94616efa7f2acd92733df9f408714c5867a87f53
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/31511Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>