Add optional encoder debug logging to VkEncoder am: b4cd4d845e

Original change: https://android-review.googlesource.com/c/platform/external/gfxstream-protocols/+/2109427

Change-Id: I43b01ee7e25adc4ae16d34eb213e1b288f82c1a1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>