ARM: dts: rk312x: add pcfg_output_high

This add a pcfg_output_high label so pinctl can set
a gpio output high by default in dts.

Change-Id: Ie4aa2dd59df3110b8e24d0a07cc9961ee086272a
Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>

arch/arm/boot/dts/rk312x.dtsi

@@ -1126,6 +1126,10 @@
 			bias-pull-pin-default;
 		};
 
+		pcfg_output_high: pcfg-output-high {
+			output-high;
+		};
+
 		pcfg_pull_none: pcfg-pull-none {
 			bias-disable;
 		};