Request focus when pin is visible

Change-Id: Idfa7f0ea7f989de95030ed9dbd0ac4b45abc8155
Fixes: 77963692
Fixes: 78187153
Fixes: 78235570
Fixes: 78887466
Test: atest tests/src/com/android/keyguard/KeyguardPinBasedInputViewTest.java
Test: atest tests/src/com/android/systemui/statusbar/phone/KeyguardBouncerTest.java
Test: atest android.server.am.ActivityManagerDisplayLockedKeyguardTests#testDismissKeyguard_whileOccluded_secondaryDisplay
Test: atest -dt android.server.am.KeyguardLockedTests#testEnterPipOverKeyguard
Test: go/sysui-bouncer-tests