Re-enable sk_VertexID support on SwiftShader Vulkan

The vertex ID bug was specific to legacy GL SwiftShader. The unit test
failure on the Vulkan cc_unittests was actually due to skia:12056.

Bug: skia:11965
Bug: skia:12056
Bug: b/188239650
Change-Id: I0fd27c6e48a7a14d0367d2e7db7e4e70cd7dad1d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/415116
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed