Add get_auth_token permission to the permission module.

This CL introduces the new permission added to sepolicy in
(aosp/1517237), into keystore2 permission module.

Bug: 159475305, 159475191
Test: atest keystore2_test
Change-Id: Ie818f96e0a13b0c43246165a1eefc5c0bfc51637
1 file changed