iwlwifi: mvm: add support for IMR based on platform

Driver needs to enable IMR which is needed for debug on
certain platforms, so add a device config flag to set it.

Signed-off-by: Mukesh Sisodiya <mukesh.sisodiya@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20220304131517.0b96b2760503.I08bc741c8c497a2edbe4784cdab6abd8d04c62f3@changeid


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