iwlwifi: mvm: clean up in power code

Reduce indentation where it is possible.
Make a function static - it wasn't used outside its file
anyway.
Remove the unneeded pm_prevent state.

Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

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

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