drm/xe/uapi: Remove DRM_XE_UFENCE_WAIT_MASK_*

Those are just possible values for the comparison mask but they are not
specific magic values. Let's keep them as examples in the documentation
but remove them from the uAPI.
Suggested-by: Matthew Brost <matthew.brost@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@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

@@ -1040,11 +1040,13 @@ struct drm_xe_wait_user_fence {
 	/** @value: compare value */
 	__u64 value;
 
-#define DRM_XE_UFENCE_WAIT_MASK_U8	0xffu
-#define DRM_XE_UFENCE_WAIT_MASK_U16	0xffffu
-#define DRM_XE_UFENCE_WAIT_MASK_U32	0xffffffffu
-#define DRM_XE_UFENCE_WAIT_MASK_U64	0xffffffffffffffffu
-	/** @mask: comparison mask */
+	/**
+	 * @mask: comparison mask, values can be for example:
+	 *  - 0xffu for u8
+	 *  - 0xffffu for u16
+	 *  - 0xffffffffu for u32
+	 *  - 0xffffffffffffffffu for u64
+	 */
 	__u64 mask;
 
 	/**