mb/google/kahlee: Move ec.h into variant include directories

The mainboard directory is included through the PI makefile - most
mainboard directories aren't in the include path at all.  Move the
ec.h file into the baseboard/variant directory that is already in
the include path.

BUG=b:69220826
TEST=Build

Change-Id: I89d361b700c66ba576de724927574fdab9461fc6
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/22497
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
8 files changed