drm/i915/pciids: remove 12 from INTEL_TGL_IDS()

Most other PCI ID macros do not encode the gen in the name. Follow suit
for TGL.

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/044a5c553dc4564431bbef197d5e2dd085624fc2.1715340032.git.jani.nikula@intel.com


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