iwlwifi: mvm: add support for PHY context command v4

A new version of this command deprecates the rxchain_info field
but is otherwise the same, so treat it the same way. We already
leave the rxchain_info zeroed since the RLC command is supported.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211204083238.aca5bd78518e.I2f1b4b38899717851ea9f5b6dd23cde27e10387a@changeid


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