Self-grant permission to post notification from work profile

The work profile instance of CtsVerifier needs POST_NOTIFICATIONS
permission to send notifications, which some tests depends on.
Self-grant the permission after the work profile is created.

Bug: 226010571
Test: CtsVerifier -> BYOD managed Provisioning > Keyguard disabled
features > Unredacted notifications disabled on keyguard

Change-Id: I092b9e1ed5c9f89ff9362060b178c1bc6952bebb
1 file changed