drm/amdgpu: Do not include <drm/drm_fb_helper.h>

Including <drm/drm_fb_helper.h> is not required, so remove the include
statements. No functional changes.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20230111130206.29974-8-tzimmermann@suse.de

drivers/gpu/drm/amd/amdgpu/dce_v10_0.c

@@ -21,7 +21,6 @@
  *
  */
 
-#include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_vblank.h>
 

drivers/gpu/drm/amd/amdgpu/dce_v11_0.c

@@ -21,7 +21,6 @@
  *
  */
 
-#include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_vblank.h>
 

drivers/gpu/drm/amd/amdgpu/dce_v6_0.c

@@ -23,7 +23,6 @@
 
 #include <linux/pci.h>
 
-#include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_vblank.h>
 

drivers/gpu/drm/amd/amdgpu/dce_v8_0.c

@@ -21,7 +21,6 @@
  *
  */
 
-#include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_vblank.h>