mei: add mei_hbuf_acquire wrapper

A client has to acquire host buffer
before writing, we add lock like wrapper
to replace the code snippet

if (dev->hbuf_is_ready)
        dev->hbuf_is_ready = false;

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/misc/mei/amthif.c
Simple merge

diff --cc drivers/misc/mei/client.c
Simple merge

diff --cc drivers/misc/mei/hw-me.c
Simple merge

diff --cc drivers/misc/mei/hw-txe.c
Simple merge

diff --cc drivers/misc/mei/interrupt.c
Simple merge

diff --cc drivers/misc/mei/mei_dev.h
Simple merge

diff --cc drivers/misc/mei/wd.c
Simple merge