Drop unused chipsets that do not use an IFD. Change-Id: I999e5e5d2063b8d33819fb22296ed486e1194cbb Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/68692 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>