mb/lenovo: Add SMBIOS type 9 for ExpressCard

Mark all known PCIe root ports as ExpressCard slot.

Tested on Lenovo T520.

Change-Id: I43fb481512a54ee054c6fd0189053028fb3c3ec2
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32309
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/lenovo/x201/devicetree.cb b/src/mainboard/lenovo/x201/devicetree.cb
index fa33aeb..6ece08b 100644
--- a/src/mainboard/lenovo/x201/devicetree.cb
+++ b/src/mainboard/lenovo/x201/devicetree.cb
@@ -92,7 +92,9 @@
 
 			device pci 1c.0 on end # PCIe Port #1
 			device pci 1c.1 on end # PCIe Port #2 (wwan)
-			device pci 1c.3 on end # PCIe Port #4 (Expresscard)
+			device pci 1c.3 on
+				smbios_slot_desc "7" "3" "ExpressCard Slot" "8"
+			end # PCIe Port #4 (Expresscard)
 			device pci 1c.4 on end # PCIe Port #5 (wlan)
 
 			device pci 1d.0 on # USB2 EHCI