cfg80211: ibss: use 11a mandatory rates for 6GHz band operation

The default mandatory rates, ie. when not specified by user-space, is
determined by the band. Select 11a rateset for 6GHz band.

Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Leon Zegers <leon.zegers@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Link: https://lore.kernel.org/r/1564745465-21234-8-git-send-email-arend.vanspriel@broadcom.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: 5ea4e7802c43144f5529d1b60c01853dc5c24797
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git


Change-Id: Idcac3149e63fbe91425aad2c5a88536fde11f25b
CRs-Fixed: 2536763
Signed-off-by: Liangwei Dong <liangwei@codeaurora.org>