samples: shields: npm1300_ek: update GPIO config

Update the nPM1300 GPIO configuration for the sample to match new
requirements.

Signed-off-by: Jordan Yates <[email protected]>

Author: JordanYates

samples/shields/npm1300_ek/nrf52dk_nrf52832.overlay

@@ -20,19 +20,19 @@
 &npm1300_ek_buck2 {
 	regulator-init-microvolt = <3300000>;
 	retention-microvolt = <2500000>;
-	enable-gpios = <&npm1300_ek_gpio 1 GPIO_ACTIVE_LOW>;
-	retention-gpios = <&npm1300_ek_gpio 2 GPIO_ACTIVE_HIGH>;
-	pwm-gpios = <&npm1300_ek_gpio 2 GPIO_ACTIVE_LOW>;
+	enable-gpio-config = <1 GPIO_ACTIVE_LOW>;
+	retention-gpio-config = <2 GPIO_ACTIVE_HIGH>;
+	pwm-gpio-config = <2 GPIO_ACTIVE_LOW>;
 };
 
 &npm1300_ek_ldo1 {
 	regulator-initial-mode = <NPM1300_LDSW_MODE_LDO>;
-	enable-gpios = <&npm1300_ek_gpio 2 GPIO_ACTIVE_LOW>;
+	enable-gpio-config = <2 GPIO_ACTIVE_LOW>;
 };
 
 &npm1300_ek_ldo2 {
 	regulator-initial-mode = <NPM1300_LDSW_MODE_LDSW>;
-	enable-gpios = <&npm1300_ek_gpio 2 GPIO_ACTIVE_LOW>;
+	enable-gpio-config = <2 GPIO_ACTIVE_LOW>;
 };
 
 &npm1300_ek_pmic {