ARM: dts: am43xx: replace status value "ok" by "okay"

While the DT parser recognizes "ok" as a valid value for the
"status" property, it is actually mentioned nowhere. Use the
proper value "okay" instead, as done in the majority of files
already.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am437x-gp-evm.dts

@@ -1024,7 +1024,7 @@
 };
 
 &dss {
-	status = "ok";
+	status = "okay";
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&dss_pins>;

arch/arm/boot/dts/am437x-sbc-t43.dts

@@ -136,7 +136,7 @@
 };
 
 &dss {
-	status = "ok";
+	status = "okay";
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&dss_pinctrl_default>;

arch/arm/boot/dts/am43x-epos-evm.dts

@@ -948,7 +948,7 @@
 };
 
 &dss {
-	status = "ok";
+	status = "okay";
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&dss_pins>;