The two called bindDescriptorSets with a fixed GRAPHICS or COMPUTE bind
point enum value.  The differentation however would result in
unnecessary code duplication with upcoming compute support.

Bug: angleproject:3562
Change-Id: Ica4400c573a90fda168c64ad777d87aa83256e48
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1703524Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>