pixel-sepolicy: pixelstats: add /proc/vendor_mm/* am: 82debdc81a

Original change: https://android-review.googlesource.com/c/platform/hardware/google/pixel-sepolicy/+/3126313

Change-Id: Iea0e925df18ffa58bc9528fbf039062153fc7c50
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>