drm/xe: Fix build without CONFIG_FAULT_INJECTION

Ideally this header could be included without the CONFIG_FAULT_INJECTION
and it would take care itself for the includes it needs.
So, let's temporary workaround this by moving this below and including
only when CONFIG_FAULT_INJECTION is selected to avoid build breakages.

Another solution would be us including the linux/types.h as well, but
this creates unnecessary cases.

Reference: https://lore.kernel.org/all/20230816134748.979231-1-himal.prasad.ghimiray@intel.com/
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: Oded Gabbay <ogabbay@kernel.org>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

drivers/gpu/drm/xe/xe_debugfs.c

@@ -5,7 +5,6 @@
 
 #include "xe_debugfs.h"
 
-#include <linux/fault-inject.h>
 #include <linux/string_helpers.h>
 
 #include <drm/drm_debugfs.h>
@@ -22,6 +21,7 @@
 #endif
 
 #ifdef CONFIG_FAULT_INJECTION
+#include <linux/fault-inject.h> /* XXX: fault-inject.h is broken */
 DECLARE_FAULT_ATTR(gt_reset_failure);
 #endif
 

drivers/gpu/drm/xe/xe_gt.h

@@ -7,7 +7,6 @@
 #define _XE_GT_H_
 
 #include <drm/drm_util.h>
-#include <linux/fault-inject.h>
 
 #include "xe_device_types.h"
 #include "xe_hw_engine.h"
@@ -20,6 +19,7 @@
 #define CCS_MASK(gt) (((gt)->info.engine_mask & XE_HW_ENGINE_CCS_MASK) >> XE_HW_ENGINE_CCS0)
 
 #ifdef CONFIG_FAULT_INJECTION
+#include <linux/fault-inject.h> /* XXX: fault-inject.h is broken */
 extern struct fault_attr gt_reset_failure;
 static inline bool xe_fault_inject_gt_reset(void)
 {