drm/i915/ehl: Add EHL platform info and PCI IDs

Add known EHL PCI IDs.

v2 (Rodrigo): Removed x86 early quirk. To be sent in a separated
   	      patch cc'ing the appropriated list and maintainers for
	      proper ack.
v3: (Rodrigo): - Removed .num_pipes = 3 that is coming since GEN&_FEATURES.
    	       - Added ppgtt type and size after rework from Bob and Chris
v4: (Rodrigo): - remove ppgtt type added on v3. Jose pointed it is not
    	       	 needed.

Cc: Bob Paauwe <bob.j.paauwe@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: James Ausmus <james.ausmus@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Bob Paauwe <bob.j.paauwe@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190322175847.25707-1-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/i915_pci.c

@@ -730,6 +730,14 @@ static const struct intel_device_info intel_icelake_11_info = {
 		BIT(RCS0) | BIT(BCS0) | BIT(VECS0) | BIT(VCS0) | BIT(VCS2),
 };
 
+static const struct intel_device_info intel_elkhartlake_info = {
+	GEN11_FEATURES,
+	PLATFORM(INTEL_ICELAKE),
+	.is_alpha_support = 1,
+	.engine_mask = BIT(RCS0) | BIT(BCS0) | BIT(VCS0),
+	.ppgtt_size = 36,
+};
+
 #undef GEN
 #undef PLATFORM
 
@@ -799,6 +807,7 @@ static const struct pci_device_id pciidlist[] = {
 	INTEL_CML_GT2_IDS(&intel_coffeelake_gt2_info),
 	INTEL_CNL_IDS(&intel_cannonlake_info),
 	INTEL_ICL_11_IDS(&intel_icelake_11_info),
+	INTEL_EHL_IDS(&intel_elkhartlake_info),
 	{0, 0, 0}
 };
 MODULE_DEVICE_TABLE(pci, pciidlist);

include/drm/i915_pciids.h

@@ -498,4 +498,11 @@
 	INTEL_VGA_DEVICE(0x8A70, info), \
 	INTEL_VGA_DEVICE(0x8A53, info)
 
+/* EHL */
+#define INTEL_EHL_IDS(info) \
+	INTEL_VGA_DEVICE(0x4500, info),	\
+	INTEL_VGA_DEVICE(0x4571, info), \
+	INTEL_VGA_DEVICE(0x4551, info), \
+	INTEL_VGA_DEVICE(0x4541, info)
+
 #endif /* _I915_PCIIDS_H */