resurrect mWifiLinkLayerStatsSupported counter

On devices with broken/not implemented LinkLayerStats
the counter mWifiLinkLayerStatsSupported prevents the following error
messages from appearing every 3 seconds.

03-08 10:43:02.616   389   389 E WifiHAL : wifi_get_link_stats: requestResponse Error:-3
03-08 10:43:02.617  2030  2206 E WifiVendorHal: getWifiLinkLayerStats(l.937) failed {.code = ERROR_NOT_SUPPORTED, .description = }

This partially reverts commit 1ba5b5858ffc04acbd317dc1f6789f1777d375e6.

Change-Id: I840f9d1304bf0a31e7a6b65db00a37dc3651e4b8
1 file changed