Check ims for isVoImsOptInEnabled

If the device does not have PackageManager.FEATURE_TELEPHONY_IMS,
ProvisioningManager.getProvisioningIntValue() could not be called.

Fix: 346708541
Flag: EXEMPT bug fix
Test: manual - SIM settings
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:aa0d63ce4022fa3ae29b77c299c4dce37d11b338)
Merged-In: I52b5a62d20ee7df14ecf93c9b0dbbed6f7dc0f0d
Change-Id: I52b5a62d20ee7df14ecf93c9b0dbbed6f7dc0f0d