If the all of valid channels in ACS (filtered by PCL) don’t support
320 MHz, sap_sort_chl_weight_320_mhz should return failure code and then
sap_sort_chl_weight_all will downgrade BW to lower one.
But current code doesn't update valid_chans based on channel "valid"
or not in sap_sort_chl_weight_320_mhz, which causes the API
return QDF_STATUS_SUCCESS if some channels (not "valid") support
320 MHz.
"valid" means the channel is in ACS list(filtered by PCL).
Fix by check channel "valid" or not before update valid_chans.
Change-Id: Ia634f28e09f5446a0ca53aebef8af5c003b38002
CRs-Fixed: 3552093
fa9f2fa5c0