drm/i915/skl: Add missing SKL ID

Used by production device:
    Intel(R) Iris(TM) Graphics P555

Cc: <stable@vger.kernel.org>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: NMichał Winiarski <michal.winiarski@intel.com>
Reviewed-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: NMika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: NMika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170227112256.20060-1-michal.winiarski@intel.com

include/drm/i915_pciids.h

@@ -265,7 +265,8 @@
 	INTEL_VGA_DEVICE(0x1923, info), /* ULT GT3 */ \
 	INTEL_VGA_DEVICE(0x1926, info), /* ULT GT3 */ \
 	INTEL_VGA_DEVICE(0x1927, info), /* ULT GT3 */ \
-	INTEL_VGA_DEVICE(0x192B, info)  /* Halo GT3 */ \
+	INTEL_VGA_DEVICE(0x192B, info), /* Halo GT3 */ \
+	INTEL_VGA_DEVICE(0x192D, info)  /* SRV GT3 */
 
 #define INTEL_SKL_GT4_IDS(info) \
 	INTEL_VGA_DEVICE(0x1932, info), /* DT GT4 */ \