lenovo/x60: Remove leftover declaration

Change-Id: I1ab2118a3127dfacef6a389abd59050493e640fb
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6817
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)