TunerTest: fix cts testFrontendStatus fail [1/1]

PD#TV-86435
bug#295097130

Problem:
android.media.tv.tuner.cts.TunerTest#testFrontendStatus Fail

Solution:
In ANALOG mode, don't get modulation;
because ANALOG don't have modulation option;

Verify:
ohm

Change-Id: Ibdb6ec781c5a5e2cce04e16421f456256fd821e1