Run ImsSmsListener callbacks as self.

Earlier there was an implicit assumption that IMS (caller of the
callbacks) runs under the same uid, but that may not always be
true now.

Test: atest SmsManagerTest
Bug: 162487575
Merged-in: Ic0bb62c3b960fda8708e7bebefb1154a2380fd4f
Change-Id: Ic0bb62c3b960fda8708e7bebefb1154a2380fd4f
1 file changed