wifi: iwlwifi: mvm: make functions public

In the following patch, iwl_mvm_roc_duration_and_delay and
iwl_mvm_roc_add_cmd will be called also from time-event.c.
Move then there (where they more belong) and make then
public.

Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240201155157.3edafc4d59aa.Ic68e90758bcad9ae00e0aa602101842dac60e1a1@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>