dt-binding: gce: add gce header file for mt8365
requested to merge mediatek/aiot/team-mtk-aiot-sw-ss2/linux-20211005:mac/dev-i350mdp-k5.10 into mtk-v5.10
Add documentation for the mt8365 gce.
Add gce header file defined the gce hardware event, subsys number and constant for mt8365.
Signed-off-by: Macross Chen macross.chen@mediatek.com