Merge "Create sepolicy for allowing system_server rw in /metadata/staged-install" into rvc-dev am: b1ab605166 am: a24edb5aeb

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/sepolicy/+/11408966

Change-Id: I9c5fa0f609b67bcad2b3937b102b2f95512f11b7