iwlwifi: add enter/exit D0i3 ops

Add new enter_d0i3 and exit_d0i3 ops that
will be called by the transport on D0i3 enter/exit.

Each one of these ops will include the host commands
mentionned in the previous patch.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

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

diff --cc drivers/net/wireless/iwlwifi/iwl-op-mode.h
Simple merge

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