intel: Introducing Amber Lake platform

Amber Lake uses the same gen graphics as Kaby Lake, including a id
that were previously marked as reserved on Kaby Lake, but that
now is moved to AML page.

This follows the ids and approach used on kernel's commit
e364672477a1 ("drm/i915/aml: Introducing Amber Lake platform")

Reported-by: Timo Aaltonen <timo.aaltonen@canonical.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Anuj Phogat <anuj.phogat@gmail.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/dev/gen_device_info.c

@@ -57,6 +57,7 @@ gen_device_name_to_pci_device_id(const char *name)
       { "skl", 0x1912 },
       { "bxt", 0x5A85 },
       { "kbl", 0x5912 },
+      { "aml", 0x591C },
       { "glk", 0x3185 },
       { "cfl", 0x3E9B },
       { "cnl", 0x5a52 },