ARM: dts: am335x-myirtech: Add missing NAND wait pin definition

The NAND wait pin is connected to the GPMC, but this is not mentioned
in the DT bindings. Let's fix this.
Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com>
Message-Id: <20230524091157.775960-1-eagle.alexander923@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-myirtech-myc.dtsi

@@ -127,6 +127,7 @@ nand0: nand@0,0 {
 		gpmc,bus-turnaround-ns = <0>;
 		gpmc,cycle2cycle-delay-ns = <0>;
 		gpmc,clk-activation-ns = <0>;
+		gpmc,wait-pin = <0>;
 		gpmc,wr-access-ns = <40>;
 		gpmc,wr-data-mux-bus-ns = <0>;
 		ti,elm-id = <&elm>;