Add logic to hide HCO and VCO for TTY based on RTT

When specified in the carrier config, hide the HCO and VCO options for
TTY in accessiblity settings if RTT is available on the device/carrier.

Fixes: 137672992
Test: manual
Change-Id: If2e1762c4ad378e7f57e5a82377b6722d3595977
1 file changed