drm/xe: Cleanup xe_mmio.h

We don't need <linux/delay.h> include since commit 5c09bd6
("drm/xe/mmio: Move xe_mmio_wait32() to xe_mmio.c").

We don't need <linux/io-64-nonatomic-lo-hi.h> include since commit
54c6596 ("drm/xe: Make xe_mmio_read|write() functions non-inline").

And since commit 924e6a9 ("drm/xe/uapi: Remove MMIO ioctl")
we don't need forward declarations of drm_device and drm_file.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240520181814.2392-4-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/xe_mmio.c

@@ -3,10 +3,12 @@
  * Copyright © 2021-2023 Intel Corporation
  */
 
-#include <linux/minmax.h>
-
 #include "xe_mmio.h"
 
+#include <linux/delay.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/minmax.h>
+
 #include <drm/drm_managed.h>
 #include <drm/xe_drm.h>
 
@@ -19,6 +21,7 @@
 #include "xe_ggtt.h"
 #include "xe_gt.h"
 #include "xe_gt_mcr.h"
+#include "xe_gt_printk.h"
 #include "xe_macros.h"
 #include "xe_module.h"
 #include "xe_sriov.h"

drivers/gpu/drm/xe/xe_mmio.h

@@ -6,17 +6,10 @@
 #ifndef _XE_MMIO_H_
 #define _XE_MMIO_H_
 
-#include <linux/delay.h>
-#include <linux/io-64-nonatomic-lo-hi.h>
-
-#include "regs/xe_reg_defs.h"
-#include "xe_device_types.h"
-#include "xe_gt_printk.h"
 #include "xe_gt_types.h"
 
-struct drm_device;
-struct drm_file;
 struct xe_device;
+struct xe_reg;
 
 #define LMEM_BAR		2