mainboard/google/poppy: Add support for ELAN device

Add support for ELAN 5515 device.

BUG=b:62331218

Change-Id: Id91a41743330c9e356293cfda7b2e3743dcd480c
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/20040
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2 files changed