Add FLAG_IMMUTABLE to PendingIntent in LegacyModeSmsHandler.

Bug: 185126549, 185126319
Test: manual.

Merged-In: I1024353434674f8e4bf164c3a6c1e16924dfaa8f
Change-Id: I3b015de3187f45096235313e8d39a3c3f1b768b7
(cherry picked from commit bdd6d1ea00f94296c251f4340a52a2035167370b)
Merged-In:I3b015de3187f45096235313e8d39a3c3f1b768b7
1 file changed