Improvements for the Wifi Chip VTS test.

Changes include:
 - Add call to stopLoggingToDebugRingBuffer
   in the debug ring buffer test
 - Remove explicit getName tests for STA and
   NAN ifaces, since these methods are already
   tested implicity in the Wifi Chip test

Note that the two getName tests were added this
year, so they should not be needed.

Bug: 386810503
Test: atest VtsHalWifiChipTargetTest \
            VtsHalWifiNanIfaceTargetTest \
            VtsHalWifiStaIfaceTargetTest
Change-Id: I0b89374d3ecc139e9b28f184c3f6dad76c8c76c0