sepolicy: Make the GRF properties readable from R system.

This change is similar to aosp/1640163 aosp/1666539
making the properties readable from an R system image.

Bug: 185406969
(cherry picked from commit ef89a2a7e31a94288e0d11b227a1e19590433d8e)
Change-Id: I70cbe633f24a16d9f8046d502be3eba3404a0ef8
1 file changed
tree: d6bdada8393bd4b4b8309ef8120dcc0401e18301
  1. generic/
  2. legacy/
  3. qva/
  4. SEPolicy.mk