power domain: MediaTek: add power domain driver for MT7629 SoC

This adds a power domain driver for the Mediatek SCPSYS unit.

The System Control Processor System (SCPSYS) has several power
management related tasks in the system. The tasks include thermal
measurement, dynamic voltage frequency scaling (DVFS), interrupt
filter and lowlevel sleep control. The System Power Manager (SPM)
inside the SCPSYS is for the MTCMOS power domain control.

For now this driver only adds power domain support.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
index a08b428..93deaef 100644
--- a/drivers/power/domain/Kconfig
+++ b/drivers/power/domain/Kconfig
@@ -23,6 +23,13 @@
           Enable support for manipulating NXP i.MX8 on-SoC power domains via IPC
           requests to the SCU.
 
+config MTK_POWER_DOMAIN
+	bool "Enable the MediaTek power domain driver"
+	depends on POWER_DOMAIN && ARCH_MEDIATEK
+	help
+	  Enable support for manipulating MediaTek power domains via MMIO
+	  mapped registers.
+
 config MESON_GX_VPU_POWER_DOMAIN
 	bool "Enable Amlogic Meson GX VPU power domain driver"
 	depends on ARCH_MESON