Grant permission before testing revoke permission

Invoking revokeRuntimePermission w/o grant permission
doesn't trigger permission change event. The test was
passing due to permission change event generated by
package install. Adding waitForBroadcasts to prevent
package install permission change event interfere with
the test.

Fix: 311722847
Test: abtd
Test: atest PermissionUpdateListenerTest --iterations 10
Change-Id: I968407341b253e6e9583ec511fbfc76d5b4da34c