Clean up old file-based OTA SELinux rules

Remove a number of SELinux rules which were required to support file
based OTA. After this, we can have a much stronger assertion that files
on /system are immutable. Tighten up the neverallow rules at the same
time.

Bug: 35853185
Bug: 15575013
Test: adb reboot recovery && adb sideload [file]
Change-Id: I4238d17808bed6a81f47e14eb1797496c07642e2