Rename gpu_mem.o to gpuMem.o am: 7acc4e6db6

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2146978

Change-Id: Ie058f917cfd4038133a98d91fde544f0b268f7b3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>