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
Test: manual runs with KFENCE enabled
Signed-off-by: Alexander Potapenko <glider@google.com>
Change-Id: I828666ec3154aadf138cfa552832a66ad8f4a201
5 files changed