SEPolicy changes to allow vendor BoringSSL self test.

Introduces new domain vendor_boringssl_self_test and runs
/vendor/bin/boringssl_self_test(32|64) in it. New domain
required because boringssl_self_test needs to be in
coredomain in order to reboot the device, but vendor code
may not run in coredomain.

Bug: 141150335
Test: flashall && manually verify no selinux errors logged and that
    four flag files are created in /dev/boringssl, two by the
    system self tests and two by the vendor.

Change-Id: I46e2a5ea338eddacdfd089f696295dbd16795c5a
3 files changed