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Google's internal master has been updated to not use
/dev/mem. Update the SELinux rules to allow for this.

Keep rmt in permissive for AOSP. The updated userspace / kernel
aren't in AOSP, and we don't want to break those users.
We'll flip this to enforcing in Google's internal tree.

Change-Id: I18fdc7d6c718252e1efe4f1a4dabfc6866c1dc8d