UPSTREAM: wifi: cfg80211: remove scan_width support

There really isn't any support for scanning at different
channel widths than 20 MHz since there's no way to set it.
Remove this support for now, if somebody wants to maintain
this whole thing later we can revisit how it should work.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Bug: 338806915
Change-Id: I05be224b9669d59fca1aa985e99d52d0a3ee760f
(cherry picked from commit 5add321c)
Signed-off-by: Veerendranath Jakkam <quic_vjakkam@quicinc.com>