mb/google/hatch/var/kindred: Implement variant_devtree_update()
This change provides an implementation of variant_devtree_update() for
kindred that disable eMMC controller when SKU ID = 1 or 3
BUG=b:
132918661
TEST=Verify eMMC is disabled when SKU ID = 1 or 3
Change-Id: I8ccb4dae54f223881e0ced9e034bf45b994cc6f2
Signed-off-by: David Wu <david_wu@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34400
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>