Revert "Added a new network capability MMTEL"

Revert "Added a new network capability MMTEL"

Revert submission 1927643-mmtel_capability

Reason for revert: b/211586152
Reverted Changes:
Ifea8b1e40:Added a new network capability MMTEL
I38655bef2:Added a new network capability MMTEL
I837606d9e:Added setup/tear down data support
I2c7b291fe:Added a new network capability MMTEL

Change-Id: Ifd818ba06bc8c6a10bf0393243443d049e5d7503