pixel-sepolicy: pixelstats: add /proc/vendor_mm/* am: 82debdc81a am: b8202db003

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

Change-Id: Idd7261c0ebbf43ab45488e1f361e01e79b962d1c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>