drm/i915/pciids: add INTEL_ILK_IDS(), use acronym

Most other PCI ID macros use platform acronyms. Follow suit for ILK. Add
INTEL_ILK_IDS() to identify all ILKs.

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patchwork.freedesktop.org/patch/msgid/27ada56363cfa6a5b093cb31908a4b89aa912621.1715340032.git.jani.nikula@intel.com


Signed-off-by: Jani Nikula <jani.nikula@intel.com>