Patch merged into coreboot/master: mainboards, ec: provide common declaration for mainboard_ec_init()

the following patch was just integrated into master:
commit 91fa9d7696ef88e580caa1f762e72bd9e3e18a18
Author: Aaron Durbin 
Date:   Fri Sep 23 16:38:27 2016 -0500

mainboards,ec: provide common declaration for mainboard_ec_init()

Add a header file to provide common declarations that the
    mainboards can use regarding EC init.

BUG=chrome-os-partner:56677

Change-Id: Iaa0b37eff4de644e969a18364713b90b7f27fa1c
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/16734
    Reviewed-by: Duncan Laurie 
    Reviewed-by: Matt DeVillier 
    Tested-by: build bot (Jenkins)

See https://review.coreboot.org/16734 for details.

-gerrit