mailbox: Remove mailbox_client.h from controller drivers

mailbox_client.h should be used by mailbox consumer drivers, not mailbox
controller (provider) drivers. The affected drivers do not use any mailbox
client APIs, so the include can be safely removed.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Sudeep Holla <sudeep.holla@kernel.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

drivers/mailbox/bcm-flexrm-mailbox.c

@@ -26,7 +26,6 @@
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/mailbox_controller.h>
-#include <linux/mailbox_client.h>
 #include <linux/mailbox/brcm-message.h>
 #include <linux/module.h>
 #include <linux/msi.h>

drivers/mailbox/cv1800-mailbox.c

@@ -11,7 +11,6 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kfifo.h>
-#include <linux/mailbox_client.h>
 #include <linux/mailbox_controller.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>

drivers/mailbox/omap-mailbox.c

@@ -21,7 +21,6 @@
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/mailbox_controller.h>
-#include <linux/mailbox_client.h>
 
 #include "mailbox.h"