drm/i915: fix build with missing debugfs includes

/home/airlied/devel/kernel/dim/src/drivers/gpu/drm/i915/i915_debugfs_params.c:213:9: error: call to undeclared function 'debugfs_create_file_unsafe'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
return debugfs_create_file_unsafe(name, mode, parent, value,
^
/home/airlied/devel/kernel/dim/src/drivers/gpu/drm/i915/i915_debugfs_params.c:213:9: error: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct dentry *' [-Wint-conversion]
return debugfs_create_file_unsafe(name, mode, parent, value,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/airlied/devel/kernel/dim/src/drivers/gpu/drm/i915/i915_debugfs_params.c:222:9: error: call to undeclared function 'debugfs_create_file_unsafe'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
return debugfs_create_file_unsafe(name, mode, parent, value,
^
/home/airlied/devel/kernel/dim/src/drivers/gpu/drm/i915/i915_debugfs_params.c:222:9: error: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct dentry *' [-Wint-conversion]
return debugfs_create_file_unsafe(name, mode, parent, value,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Building with clang gave me a bunch of similiar fails to the above.

Fixes: 33d5ae6cacf4 ("drm/print: drop include debugfs.h and include where needed")
Signed-off-by: Dave Airlie <[e-mail]>

drivers/gpu/drm/i915/i915_debugfs.c

···
 #include <linux/sort.h>
 #include <linux/string_helpers.h>
 
+#include <linux/debugfs.h>
 #include <drm/drm_debugfs.h>
 
 #include "display/intel_display_params.h"

drivers/gpu/drm/i915/i915_debugfs_params.c

···
  */
 
 #include <linux/kernel.h>
+#include <linux/debugfs.h>
 
 #include "i915_debugfs_params.h"
 #include "gt/intel_gt.h"

drivers/gpu/drm/i915/i915_gpu_error.c

···
  */
 
 #include <linux/ascii85.h>
+#include <linux/debugfs.h>
 #include <linux/highmem.h>
 #include <linux/nmi.h>
 #include <linux/pagevec.h>