cfg80211: reject HT/VHT capabilities on 6 GHz band

On the 6 GHz band, HE should be used, but without any direct HT/VHT
capabilities, instead the HE 6 GHz band capabilities will capture
the relevant information. Reject HT/VHT capabilities here.

Link: https://lore.kernel.org/r/20200528213443.bfe89c35459a.Ibba5e066fa0087fd49d13cfee89d196ea0c68ae2@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: 461ce35d5535c1479384f67fcf4bfc3f3610edca
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git


CRs-Fixed: 2743684
Change-Id: Ifa43d1fc10c35cee2778e27a212fe6e1ad70d487
Signed-off-by: Vinita S. Maloo <vmaloo@codeaurora.org>