Fix kotlin nullable errors in Settings

Fix kotlin nullable errors that were exposed by setting the retention
of android.annotation.NonNull and android.annotation.Nullable to
class retention.

Bug: 294110802
Test: builds
Change-Id: I6aa0516fa4f6443b6d4dff873baf3b08ff9189f0

src/com/android/settings/notification/app/FullScreenIntentPermissionPreferenceController.kt

@@ -81,7 +81,7 @@ class FullScreenIntentPermissionPreferenceController(
     private fun isPermissionRequested(): Boolean {
         val packageInfo = packageManager.getPackageInfo(packageName, GET_PERMISSIONS)
 
-        for (requestedPermission in packageInfo.requestedPermissions) {
+        for (requestedPermission in packageInfo.requestedPermissions.orEmpty()) {
             if (USE_FULL_SCREEN_INTENT.equals(requestedPermission)) {
                 return true
             }
@@ -115,4 +115,4 @@ class FullScreenIntentPermissionPreferenceController(
         const val KEY_FSI_PERMISSION = "fsi_permission"
         const val TAG = "FsiPermPrefController"
     }
-}
+}