Add permission check and clear callers identity for setUiccApplicationsEnabled.

setUiccApplicationsEnabled is not a @SystemApi. So we need to check
modify phone state permission and clear / restore callers' identity.

Bug: 154865542
Test: manual - install test app with modify phone state and make sure
the operation can be done correctly.

Change-Id: I39fbaba46c9752491b39183743bb3af1e81e8783
Merged-In: I39fbaba46c9752491b39183743bb3af1e81e8783