Add TEST_MAPPING for pre-submit tests

Run SELinuxHostTest whenever a change is made.

Filtering the tests to the ones that check that priv-apps are running in
their own domains.

Bug: 143172058
Test: Running "atest" in system/sepolicy runs SELinuxHostTest
Change-Id: If17642400129e97eb3bf2f631e784f92826adb9a
1 file changed