mb/lenovo/t430/devicetree: Add missing TPM entry

Tested on Lenovo T430:
The TPM is advertised through ACPI tables and the version can be
read using tpm_version, tcsd and tpm_tis.

Change-Id: I0b0c39e7aa1be4a479325d4b5eff5892a7e2f69f
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/26780
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/lenovo/t430/devicetree.cb

@@ -165,6 +165,9 @@ chip northbridge/intel/sandybridge
 
 					register "has_thinker1" = "0"
 				end
+				chip drivers/pc80/tpm
+					device pnp 0c31.0 on end
+				end
 			end
 			device pci 1f.2 on # SATA Controller 1
 				subsystemid 0x17aa 0x21f3