drm/xe/uapi: Move CPU_CACHING defines before doc

Move those defines to align on the rule used elsewhere in the file which
was introduced by commit 4f082f2c ("drm/xe: Move defines before
relevant fields").
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: José Roberto de Souza <jose.souza@intel.com>
Acked-by: Mateusz Naklicki <mateusz.naklicki@intel.com>
Signed-off-by: Francois Dugast <francois.dugast@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

include/uapi/drm/xe_drm.h

@@ -733,12 +733,12 @@ struct drm_xe_gem_create {
 	 */
 	__u32 handle;
 
+#define DRM_XE_GEM_CPU_CACHING_WB                      1
+#define DRM_XE_GEM_CPU_CACHING_WC                      2
 	/**
 	 * @cpu_caching: The CPU caching mode to select for this object. If
 	 * mmaping the object the mode selected here will also be used.
 	 */
-#define DRM_XE_GEM_CPU_CACHING_WB                      1
-#define DRM_XE_GEM_CPU_CACHING_WC                      2
 	__u16 cpu_caching;
 	/** @pad: MBZ */
 	__u16 pad[3];