Identify samplerExternalOES in sampler array am: 9212a425a4

Original change: https://android-review.googlesource.com/c/device/generic/goldfish-opengl/+/2055509

Change-Id: Ie8df413e4eedf677b408d7a7401293440fc1e02f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>