Telecom CUJ Emergency call tests telephony check

Ensure we perform the telecom/telephony feature check after calling
setUp on the base class. Otherwise, the corresponding member variables
aren't initialized and will always fail in the assumption.

Bug: 401009889
Test: atest CtsTelecomCujTestCases
Flag: EXEMPT test fix

Change-Id: I2e08f993c8d332a1a313db11370775376c0d8b4c