nl80211: add EHT MCS support

Add support for reporting and calculating EHT bitrates.

Signed-off-by: Veerendranath Jakkam <quic_vjakkam@quicinc.com>
Link: https://lore.kernel.org/r/1640163883-12696-7-git-send-email-quic_vjakkam@quicinc.com
Link: https://lore.kernel.org/r/20220214163009.175289-2-johannes@sipsolutions.net


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