lenovo/x201: Add support for Lenovo X201 (Calpella-based laptop)

Was extensively tested on my X201.
More info on the wiki

Change-Id: I503d77749780422e446b48224ca98a1f22a2c180
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4514
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
27 files changed