Fixed SPIR-V geometry shaders

sk_in count was being computed incorrectly, and the capabilities and interfaces
were incorrect.

Bug: skia:8143
Change-Id: If9ac7c152a3b04be3b81ead09270af6d053e006e
Reviewed-on: https://skia-review.googlesource.com/141230
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2 files changed