drm/i915/bxt: Update revision id for BXT C0

Cc: Nick Hoath <nicholas.hoath@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ba4596e..6c3ef9c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2507,7 +2507,7 @@
 
 #define BXT_REVID_A0		(0x0)
 #define BXT_REVID_B0		(0x3)
-#define BXT_REVID_C0		(0x6)
+#define BXT_REVID_C0		(0x9)
 
 /*
  * The genX designation typically refers to the render engine, so render