rockchip: rk3399-puma: Cleanup of vdd_log DTS entry.

This patch eliminates the non-standard entries "rockchip,pwm_id"
and "rockchip,pwm_voltage". They are neither documented nor
read out by any driver.

Additionally it introduces the entry regulator-init-microvolt
and sets it to 900 mV, which is the default target value
for VDD_LOG.
Signed-off-by: NChristoph Muellner <christoph.muellner@theobroma-systems.com>
Reviewed-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/dts/rk3399-puma.dtsi

@@ -172,10 +172,7 @@
 		regulator-max-microvolt = <1400000>;
 		regulator-always-on;
 		regulator-boot-on;
-
-		/* for rockchip boot on */
-		rockchip,pwm_id= <2>;
-		rockchip,pwm_voltage = <1000000>;
+		regulator-init-microvolt = <900000>;
 	};
 };