cm: config: Build telephony-ext for all devices

TeleService (com.android.phone), which is built on all devices,
also has dependencies on telephony-ext. As telephony-ext is
currently absent on non-telephony devices (most tablets),
FCs are rampant on these devices.

Build telephony-ext for all device configurations to fix
the dependencies.

Change-Id: I4094ace3764d9f41ed28fbb62067ad2b2228c3a7