Do not check the returned value in the

VTS test for IWifiChip#getFeatureSet.

Some implementations of the legacy HAL,
such as Goldfish, do not have any
supported features.

Bug: 273886122
Test: atest VtsHalWifiChipTargetTest
       (tested on Cuttlefish)
Change-Id: I3ca22187cab0e77d36a28908e57ff4970535e4ae