arm: dts: rockchip: add some common pin-settings to rk3399

Those pins would be used by many boards.

Commit grabbed from Linux:

commit b41023282d07b61a53e2c9b9508912b1e7ce7b4f
Author: Randy Li <ayaka@soulik.info>
Date:   Thu Jun 21 21:32:10 2018 +0800

    arm64: dts: rockchip: add some common pin-settings to rk3399

    Those pins would be used by many boards.
Signed-off-by: NRandy Li <ayaka@soulik.info>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Acked-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Signed-off-by: NRandy Li <ayaka@soulik.info>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NEzequiel Garcia <ezequiel@collabora.com>
Tested-by: NPeter Robinson <pbrobinson@gmail.com>
Reviewed-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/dts/rk3399.dtsi

@@ -1598,19 +1598,49 @@
 			drive-strength = <12>;
 		};
 
+		pcfg_pull_none_13ma: pcfg-pull-none-13ma {
+			bias-disable;
+			drive-strength = <13>;
+		};
+
+		pcfg_pull_none_18ma: pcfg-pull-none-18ma {
+			bias-disable;
+			drive-strength = <18>;
+		};
+
+		pcfg_pull_none_20ma: pcfg-pull-none-20ma {
+			bias-disable;
+			drive-strength = <20>;
+		};
+
+		pcfg_pull_up_2ma: pcfg-pull-up-2ma {
+			bias-pull-up;
+			drive-strength = <2>;
+		};
+
 		pcfg_pull_up_8ma: pcfg-pull-up-8ma {
 			bias-pull-up;
 			drive-strength = <8>;
 		};
 
+		pcfg_pull_up_18ma: pcfg-pull-up-18ma {
+			bias-pull-up;
+			drive-strength = <18>;
+		};
+
+		pcfg_pull_up_20ma: pcfg-pull-up-20ma {
+			bias-pull-up;
+			drive-strength = <20>;
+		};
+
 		pcfg_pull_down_4ma: pcfg-pull-down-4ma {
 			bias-pull-down;
 			drive-strength = <4>;
 		};
 
-		pcfg_pull_up_2ma: pcfg-pull-up-2ma {
-			bias-pull-up;
-			drive-strength = <2>;
+		pcfg_pull_down_8ma: pcfg-pull-down-8ma {
+			bias-pull-down;
+			drive-strength = <8>;
 		};
 
 		pcfg_pull_down_12ma: pcfg-pull-down-12ma {
@@ -1618,9 +1648,22 @@
 			drive-strength = <12>;
 		};
 
-		pcfg_pull_none_13ma: pcfg-pull-none-13ma {
-			bias-disable;
-			drive-strength = <13>;
+		pcfg_pull_down_18ma: pcfg-pull-down-18ma {
+			bias-pull-down;
+			drive-strength = <18>;
+		};
+
+		pcfg_pull_down_20ma: pcfg-pull-down-20ma {
+			bias-pull-down;
+			drive-strength = <20>;
+		};
+
+		pcfg_output_high: pcfg-output-high {
+			output-high;
+		};
+
+		pcfg_output_low: pcfg-output-low {
+			output-low;
 		};
 
 		clock {