rockchip: rk3568: Select DM_REGULATOR_FIXED

Select the DM_REGULATOR_FIXED on RK3568 platform.

Co-developed-by: Suniel Mahesh <sunil@amarulasolutions.com>
Signed-off-by: Suniel Mahesh <sunil@amarulasolutions.com>
Signed-off-by: Manoj Sai <abbaraju.manojsai@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index 94665bf..a03421c 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -286,6 +286,7 @@
 	select REGMAP
 	select SYSCON
 	select BOARD_LATE_INIT
+	select DM_REGULATOR_FIXED
 	select DM_RESET
 	imply ROCKCHIP_COMMON_BOARD
 	help