Merge "make it clear mGpuMemTotalMap is R/O" into main am: ecf372879b

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2765953

Change-Id: I75fe2c630cdbbb92f04880684916358e1d709700
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>