Update automotive_display_service selinux policy

Add a permission to use the graphics allocator.

Bug: 191094033
Test: Build a target and run the service after enforcing selinux
Ignore-AOSP-First: aosp won't auto merge to sc-dev
Change-Id: I52b6851bb95565c92fc4774a2de1f0791e6fdd23
2 files changed