Add FLAG_IMMUTABLE to PendingIntents am: d94eb4458a

Original change: https://android-review.googlesource.com/c/platform/packages/apps/SettingsIntelligence/+/2229861

Change-Id: I17a5187b2564e65f851a2bb9eb9ad255782f4a7a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>