arm64: dts: allwinner: pinephone: Retain LEDs state in suspend

Allows user to set a LED before entering suspend to know that
the phone is still on (or could be used for notifications etc).
Signed-off-by: Miles Alan <m@milesalan.com>
Signed-off-by: Ondrej Jirman <megi@xff.cz>
Signed-off-by: Aren Moynihan <aren@peacevolution.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20240317004116.1473967-1-aren@peacevolution.orgSigned-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>

arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi

@@ -43,18 +43,21 @@ led-0 {
 			function = LED_FUNCTION_INDICATOR;
 			color = <LED_COLOR_ID_BLUE>;
 			gpios = <&pio 3 20 GPIO_ACTIVE_HIGH>; /* PD20 */
+			retain-state-suspended;
 		};
 
 		led-1 {
 			function = LED_FUNCTION_INDICATOR;
 			color = <LED_COLOR_ID_GREEN>;
 			gpios = <&pio 3 18 GPIO_ACTIVE_HIGH>; /* PD18 */
+			retain-state-suspended;
 		};
 
 		led-2 {
 			function = LED_FUNCTION_INDICATOR;
 			color = <LED_COLOR_ID_RED>;
 			gpios = <&pio 3 19 GPIO_ACTIVE_HIGH>; /* PD19 */
+			retain-state-suspended;
 		};
 	};