dt-bindings: mfd: da9062: Move IRQ to optional properties

Move IRQ to optional properties, because the MFD DA9061/62
is usable without IRQ. This makes the chip usable for designs
that don't have the IRQ pin connected.
Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20221122095833.3957-2-cniedermaier@dh-electronics.com

Documentation/devicetree/bindings/mfd/da9062.txt

@@ -33,11 +33,6 @@ Required properties:
     "dlg,da9061" for DA9061
 - reg : Specifies the I2C slave address (this defaults to 0x58 but it can be
   modified to match the chip's OTP settings).
-- interrupts : IRQ line information.
-- interrupt-controller
-
-See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt for
-further information on IRQ bindings.
 
 Optional properties:
 
@@ -48,6 +43,12 @@ Optional properties:
 See Documentation/devicetree/bindings/gpio/gpio.txt for further information on
 GPIO bindings.
 
+- interrupts : IRQ line information.
+- interrupt-controller
+
+See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt for
+further information on IRQ bindings.
+
 Sub-nodes:
 
 - regulators : This node defines the settings for the LDOs and BUCKs.