GPU Memory: implement libgpumem to interact with bpf am: 380893053e am: da50cb0e10 am: 35e1ef826a

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1472012

Change-Id: I7e21ccd1c3788ae913f1be45ffa87325bc71da6d