iwlwifi: mvm: add debugfs hook to take an mvm ref

Support taking an mvm ref (and preventing D0i3) by
writing '1' into the d0i3_refs debugfs file.

The reference can be unref by writing 0 to the same
file.

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

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

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