drm/xe: Remove unused define

Signed-off-by: Francois Dugast <francois.dugast@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_drv.h

@@ -11,7 +11,6 @@
 #define DRIVER_NAME		"xe"
 #define DRIVER_DESC		"Intel Xe Graphics"
 #define DRIVER_DATE		"20201103"
-#define DRIVER_TIMESTAMP	1604406085
 
 /* Interface history:
  *