linux-phytec-fsl

iwlwifi: mvm: move RX API into its own file

The RX API is currently mixed up into the general fw-api.h
file, but we're going to need to extend it significantly in
the future, so move it to its own file.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>