Mark deleteMessageFromIcc() as @UnsupportedAppUsage.

The API was exposed in ag/9766884 but reverted in ag/10665971. However
with the revert the annotation was not added back.

Test: TH
Bug: 159022482
Merged-in: Ia7d200bfd4d4565971701048b1c469a6633edeb4
Change-Id: Ia7d200bfd4d4565971701048b1c469a6633edeb4
(cherry picked from commit 1530a593)