samples: drivers: ht16k33: update to use new GPIO API

Update the HT16K33 driver sample application to use the new GPIO
flags.

Signed-off-by: Henrik Brix Andersen <[email protected]>

Author: henrikbrixandersen

samples/drivers/ht16k33/nrf52840_pca10056.overlay

@@ -12,7 +12,7 @@
 		reg = <0x70>;
 		label = "HT16K33";
                 /* Uncomment to use IRQ instead of polling: */
-		/* irq-gpios = <&gpio1 8 (GPIO_PUD_PULL_UP | GPIO_INT_ACTIVE_LOW)>; */
+		/* irq-gpios = <&gpio1 8 (GPIO_PUD_PULL_UP | GPIO_ACTIVE_LOW)>; */
 		#address-cells = <1>;
 		#size-cells = <0>;