mei: iamthif: use regular client read functions

Reduce code duplication in amthif by reusing
regular client read functions.

The change also removes the need for amthif
own buffering

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

drivers/misc/mei/client.h

diff --git a/drivers/misc/mei/client.h b/drivers/misc/mei/client.h
index 80386f9..21cf626 100644
--- a/drivers/misc/mei/client.h
+++ b/drivers/misc/mei/client.h
@@ -102,6 +102,8 @@
 int mei_cl_disconnect(struct mei_cl *cl);
 int mei_cl_connect(struct mei_cl *cl, struct file *file);
 int mei_cl_read_start(struct mei_cl *cl, size_t length);
+int mei_cl_irq_read_msg(struct mei_cl *cl, struct mei_msg_hdr *hdr,
+			struct mei_cl_cb *cmpl_list);
 int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking);
 int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 		     struct mei_cl_cb *cmpl_list);