11K test bed sends beacon report request for channel 48 with
invalid reg class 0 to DUT. So, driver gets chan_freq 0 by API
wlan_reg_chan_opclass_to_freq because of reg class 0.
To get correct channel freq for beacon report request, use new
API wlan_reg_country_chan_opclass_to_freq to
get freq from country operating class table firstly by (opclass,
channel number) pair. When the lookup is failed, the API will
try to look up by chan number only.
Change-Id: I5b56804c20d6fade17b2acaa0f7c261feebd6370
CRs-Fixed: 2603989
75698c2414