dt-bindings: rtc: moxart: use proper names for gpio properties

MOXA ART RTC driver has been switched to gpiod API and is now using
properly named properties for its gpios (with gpiolib implementing a
quirk to recognize legacy names). Change binding document to use
proper names as well.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://lore.kernel.org/r/20230201054815.4112632-2-dmitry.torokhov@gmail.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Documentation/devicetree/bindings/rtc/moxa,moxart-rtc.txt

@@ -3,15 +3,15 @@ MOXA ART real-time clock
 Required properties:
 
 - compatible : Should be "moxa,moxart-rtc"
-- gpio-rtc-sclk : RTC sclk gpio, with zero flags
-- gpio-rtc-data : RTC data gpio, with zero flags
-- gpio-rtc-reset : RTC reset gpio, with zero flags
+- rtc-sclk-gpios : RTC sclk gpio, with zero flags
+- rtc-data-gpios : RTC data gpio, with zero flags
+- rtc-reset-gpios : RTC reset gpio, with zero flags
 
 Example:
 
 	rtc: rtc {
 		compatible = "moxa,moxart-rtc";
-		gpio-rtc-sclk = <&gpio 5 0>;
-		gpio-rtc-data = <&gpio 6 0>;
-		gpio-rtc-reset = <&gpio 7 0>;
+		rtc-sclk-gpios = <&gpio 5 0>;
+		rtc-data-gpios = <&gpio 6 0>;
+		rtc-reset-gpios = <&gpio 7 0>;
 	};