Selinux policy for bootreceiver tracing instance

Create contexts for /sys/kernel/tracing/instances/bootreceiver
Allow read access to files in this dir for system_server.

Bug: 172316664
Bug: 181778620
Test: manual runs with KFENCE enabled
Signed-off-by: Alexander Potapenko <glider@google.com>
Change-Id: I7021a9f32b1392b9afb77294a1fd0a1be232b1f2
5 files changed