drm/i915/skl: add F0 stepping ID

Signed-off-by: NImre Deak <imre.deak@intel.com>
Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -2378,6 +2378,7 @@ struct drm_i915_cmd_table {
 #define SKL_REVID_C0		(0x2)
 #define SKL_REVID_D0		(0x3)
 #define SKL_REVID_E0		(0x4)
+#define SKL_REVID_F0		(0x5)
 
 #define BXT_REVID_A0		(0x0)
 #define BXT_REVID_B0		(0x3)