drm/i915/dg1: Add DG1 PCI IDs

Add the PCI ID for DG1, but keep it out of the table we use to register
the driver. At this point we can't consider the driver ready to bind to
the device since we basically miss support for everything. When more
support is merged we can enable it to work partially for example as a
display-only driver.

v2: remove DG1 from the pci table and reword commit message (Lucas)

Bspec: 44463

Cc: Matthew Auld <[email protected]>
Cc: James Ausmus <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Matt Roper <[email protected]>
Signed-off-by: Abdiel Janulgue <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>
Reviewed-by: José Roberto de Souza <[email protected]> # v1
Acked-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: Abdiel Janulgue

include/drm/i915_pciids.h

@@ -618,4 +618,8 @@
 	INTEL_VGA_DEVICE(0x4C90, info), \
 	INTEL_VGA_DEVICE(0x4C9A, info)
 
+/* DG1 */
+#define INTEL_DG1_IDS(info) \
+	INTEL_VGA_DEVICE(0x4905, info)
+
 #endif /* _I915_PCIIDS_H */