iwlwifi: support host command with copied data

In addition to the NOCOPY flag, add a DUP flag that
tells the transport to kmemdup() the buffer and free
it after the command completes.

Currently this is only supported for a single buffer
in a given command, but that could be extended if it
should be needed.

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

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

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

diff --cc drivers/net/wireless/iwlwifi/pcie/rx.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/pcie/trans.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/pcie/tx.c
Simple merge