VTS: Fix DecodeTest For Audio Decoders.

Removed extra start() from DecodeTest for audio decoders.

Test: VtsHidlC2V1_0TargetAudioDecTest -I software -C c2.android.aac.decoder -P /sdcard/res/

Bug: 127691660

Change-Id: Iff7ecdaad83ea3753c3cd444511f41deee57f782

media/codec2/hidl/1.0/vts/functional/audio/VtsHidlC2V1_0TargetAudioDecTest.cpp

@@ -515,7 +515,6 @@ TEST_P(Codec2AudioDecDecodeTest, DecodeTest) {
     if (mDisableTest) return;
 
     uint32_t streamIndex = GetParam();
-    ASSERT_EQ(mComponent->start(), C2_OK);
     mTimestampDevTest = true;
     char mURL[512], info[512];
     std::ifstream eleStream, eleInfo;