drm/i915/icl: Add initial Icelake definitions.

Icelake is an Intel® Processor containing an Intel® Graphics
Controller.

This is just an initial Icelake definition. PCI IDs, Icelake support
and new features coming in following patches.

v2: Add .ddb_size and .has_guc (Michal Wajdeczko).
v3: Add the ICL_FEATURES macro (Kelvin Gardiner).
v4 (from Paulo): Add missing __initconst (Paulo) and say "graphics
controller" instead of something that looks like an official marketing
name but isn't (Chris).

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180111180010.24357-3-paulo.r.zanoni@intel.com

drivers/gpu/drm/i915/i915_pci.c

@@ -579,6 +579,19 @@ static const struct intel_device_info intel_cannonlake_gt2_info __initconst = {
 	.gt = 2,
 };
 
+#define GEN11_FEATURES \
+	GEN10_FEATURES, \
+	.gen = 11, \
+	.ddb_size = 2048, \
+	.has_csr = 0
+
+static const struct intel_device_info intel_icelake_11_info __initconst = {
+	GEN11_FEATURES,
+	.platform = INTEL_ICELAKE,
+	.is_alpha_support = 1,
+	.has_resource_streamer = 0,
+};
+
 /*
  * Make sure any device matches here are from most specific to most
  * general.  For example, since the Quanta match is based on the subsystem