iwlwifi: mvm: remove iwl_mvm_power_mac_disable

Its logic can be implemented with
iwl_mvm_power_mac_update_mode.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

diff --cc drivers/net/wireless/iwlwifi/mvm/mac80211.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/mvm/mvm.h
Simple merge

diff --cc drivers/net/wireless/iwlwifi/mvm/power.c
Simple merge