dt-bindings: soc: add header files required for MT7623A SCPSYS dt-binding

Add relevant header files required for dt-bindings of SCPSYS power domain
control for subsystems found on MT7623A SoC.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Cc: Rob Herring <robh@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
[mb: clean-up commit message]
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

include/dt-bindings/power/mt7623a-power.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _DT_BINDINGS_POWER_MT7623A_POWER_H
+#define _DT_BINDINGS_POWER_MT7623A_POWER_H
+
+#define MT7623A_POWER_DOMAIN_CONN	0
+#define MT7623A_POWER_DOMAIN_ETH	1
+#define MT7623A_POWER_DOMAIN_HIF	2
+#define MT7623A_POWER_DOMAIN_IFR_MSC	3
+
+#endif /* _DT_BINDINGS_POWER_MT7623A_POWER_H */