Add option to not assign vk api call return val am: d0cbf1642f am: a6bdc79968

Original change: https://android-review.googlesource.com/c/platform/external/gfxstream-protocols/+/2109433

Change-Id: I1122dc9986979e995b29876d367c12e6fb81af54
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>