dt-bindings: gce: add gce header file for mt8195

Add gce header file to define the gce subsys id,
hardware event id and constant for mt8195.

Signed-off-by: jason-jh.lin <jason-jh.lin@mediatek.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

Author: jason-jh.lin