iwlwifi: mvm: Add RTS and CTS flags to iwl_tx_cmd_flags.

As part of the new rate_n_flags, the RTS and CTS flags
are being removed from it. Instead, we have these flags
in the flags field in the TX command.
Add to new flags to the iwl_tx_cmd_flags enum.

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.20211017162352.b5aaabb04432.I999f86ed6a9d9b99e63a33f724963f83f85fbb44@changeid


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