mb/google/dedede/var/cret: Add new Elan touchscreen
Add Elan eKTH7D18 touchscreen into devicetree for cret.
BUG=b:
180547935, b:
187484857
BRANCH=dedede
TEST=Built cret firmware and verified touchscreen function.
Signed-off-by: Dtrain Hsu <dtrain_hsu@compal.corp-partner.google.com>
Change-Id: Iab87ddfc7b46420439efa3e7e55c88ad4c27155d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54868
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>