Batch Compatibility changes when sub boots and fix VT bug

1) The MmTelFeature#changeEnabledCapabilities supports batching
multiple capabilitiy requests in one command. Modify ImsManager
to batch these changes into one command and send it to the modem.

2) Remove VT capability enablement in the compat layer for older
devices that expect enabling VT+VoLTE = only enable VoLTE.

3) Correct old bug in ImsManager, where we were checking VoLTE
instead of VT enabled.

Test: atest FrameworksTelephonyTests and manual
Bug: 110130897
Change-Id: Ie98e557edf5c223bc104c72f9d870b99d8d6fa38