Always regrant default permissions even if app is enabled.

We can safely skip the call to setApplicationEnabledSetting in this
case, but we should still call grantDefaultPermissions to ensure that
we re-evaluate defaults when the carrier privilege rules has changed.

This fixes userdebug OTAs where the permissions are cleared, as we
were not re-granting them after the SIM was inserted, but it is safer
in general.

Bug: 22088420
Change-Id: Ied518653790e1fbf026cd3f0ec4de22e3b21f0ba