mb/lenovo/x220: Update devicetree

- Disable unconnected PCH PCIe ports 1 + 3.
- Add smbios_slot_desc to WLAN PCIe port
- Add comment for PCIe port 7 that might have a
  XHCI controller connected (some variants only).

Test: Lenovo X220 still boots and all devices are still working
      fine. The WLAN slot is shown in dmidecode -t 9.

Change-Id: I3fdfbb7ad30e2ff8a289d9055eaef0557475fdff
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78291
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

0 files changed, 0 insertions, 0 deletions