[automerger skipped] Merge "Add FLAG_IMMUTABLE to PendingIntent in LegacyModeSmsHandler." into pi-dev am: 44b02956c4 am: 06572a0820 am: 5625595e77 am: 0642423c12 am: 30d5474b58 am: e178da4943 am: 44b61e5d3e am: fba229eea5 am: ed3db17578 -s ours

am skip reason: Merged-In I1024353434674f8e4bf164c3a6c1e16924dfaa8f with SHA-1 54dc4e8742 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Dialer/+/16199731

Change-Id: Ie11c70be0a6953ae71f6b75616180719076ac10f