soc/intel/skylake: Remove set_subsystem() from SoC

Intel common PCI driver is handle PCI subsystem ID
programming, hence no need to have an explicit soc
function to do the same.

TEST=PCI subsystem id is getting programming during
pci enumeration.

Change-Id: Iead57a286b26d532e578cfff99f412c23fd4c2fe
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/22769
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
4 files changed