iwlwifi: mvm: update definitions due to new rate & flags

As a part of preparing to the new rate & flags version
Update the relevant definitions and use them.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211017123741.5862bf4f14c4.Ib476b5443faa085539b79d49a0aebd81a213b42f@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>