lenovo/x201 & x230: Add EC info to SMBIOS.

Based on X60 counterpart.

Change-Id: I1556f75db08edf47c9313dae91072335240d46ad
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4780
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>