Currently, host sends bw value to upper layer in response
of GET_USABLE_CHAN command. but upper layer requires bw
value in form of nl80211_chan_width enum and considering
bw value as invalid and resulting into 0 bw.
Fix is to populate bw value from ch_params.ch_width instead
of populating from curr channel list and then convert to
nl80211_chan_width from phy_ch_width in hdd.
Change-Id: I1937ac2b3282224861a200a5d956a6e92109328e
CRs-Fixed: 2957055
9738504384