drm/i915: Add SKL GT1.5 PCI IDs

Add three new devices 0x1913, 0x1915, and 0x1917 also known as
iSKLULTGT15, iSKLULXGT15, and iSKLDTGT15.

Signed-off-by: Alexei Podtelezhnikov <apodtele@gmail.com>
[vsyrjala: Split separate changes into separate patchs,
           Sort the IDs]
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200716172106.2656-5-ville.syrjala@linux.intel.com


Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>