wireless: fix enabling channel 12 for custom regulatory domain

Commit e33e2241 ("Revert "cfg80211: Use 5MHz bandwidth by
default when checking usable channels"") fixed a broken
regulatory (leaving channel 12 open for AP where not permitted).
Apply a similar fix to custom regulatory domain processing.

Signed-off-by: Cathy Luo <xiaohua.luo@nxp.com>
Signed-off-by: Ganapathi Bhat <ganapathi.bhat@nxp.com>
Link: https://lore.kernel.org/r/1576836859-8945-1-git-send-email-ganapathi.bhat@nxp.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: c4b9d655
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git


CRs-Fixed: 2743684f
Change-Id: If7e0c161bba8d24cabee74007ea74a488a43317e
Signed-off-by: Vinita S. Maloo <vmaloo@codeaurora.org>