arm64: dts: mt8183: add cbas node under cros_ec

Add a 'cbas' device node for supporting tablet mode switch in
kukui devices.

Kukui platforms with detacheable base have an additional input
device under cros-ec, which reports SW_TABLET_MODE regarding
its base state (e.g. base flipped or detached).
Signed-off-by: Ikjoon Jang <ikjn@chromium.org>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>

Link: https://lore.kernel.org/r/20210609032554.2443675-1-ikjn@chromium.orgSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi

@@ -816,6 +816,10 @@ usbc_extcon: extcon0 {
 			compatible = "google,extcon-usbc-cros-ec";
 			google,usb-port-id = <0>;
 		};
+
+		cbas {
+			compatible = "google,cros-cbas";
+		};
 	};
 };