nb/intel/nehalem/vboot: Ignore invalid POSTINIT on TPM startup

During the raminit the CPU gets reset but the platform does not. To
deal with TPM init failure (a TPM can only be started up once) ignore
the invalid POSTINIT return code.

Change-Id: Ib15e796914d3e6d5f01b35fa46b3ead40f56122b
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36055
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/nehalem/Kconfig

@@ -29,6 +29,8 @@ config VBOOT
 	select VBOOT_MUST_REQUEST_DISPLAY
 	select VBOOT_STARTS_IN_BOOTBLOCK
 	select VBOOT_SEPARATE_VERSTAGE
+	# CPU is reset without platform/TPM during romstage
+	select TPM_STARTUP_IGNORE_POSTINIT
 
 config MMCONF_BUS_NUMBER
 	int