drm/i915/ehl: Add missing VECS engine

EHL can have up to one VECS(video enhancement) engine, so add it to
the device_info.

BSpec: 29152
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Bob Paauwe <bob.j.paauwe@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Clint Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: NJosé Roberto de Souza <jose.souza@intel.com>
Reviewed-by: NMatt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190614213749.15870-1-jose.souza@intel.com

drivers/gpu/drm/i915/i915_pci.c

@@ -761,7 +761,7 @@ static const struct intel_device_info intel_elkhartlake_info = {
 	GEN11_FEATURES,
 	PLATFORM(INTEL_ELKHARTLAKE),
 	.require_force_probe = 1,
-	.engine_mask = BIT(RCS0) | BIT(BCS0) | BIT(VCS0),
+	.engine_mask = BIT(RCS0) | BIT(BCS0) | BIT(VCS0) | BIT(VECS0),
 	.ppgtt_size = 36,
 };