nrf7002dk: dts: Add pull up/down to QSPI GPIO pins

Add appropriate pull up/down to QSPI GPIO pins to ensure no qspi i/o pins
on the nrf7002 DK are floating when QSPI is not in use.

Signed-off-by: Bansidhar Mangalwedhekar <bansidhar.mangalwedhekar@nordicsemi.no>

Author: bama-nordic

boards/nordic/nrf7002dk/nrf5340_cpuapp_common_pinctrl.dtsi

@@ -56,8 +56,12 @@
 				<NRF_PSEL(QSPI_IO0, 0, 13)>,
 				<NRF_PSEL(QSPI_IO1, 0, 14)>,
 				<NRF_PSEL(QSPI_IO2, 0, 15)>,
-				<NRF_PSEL(QSPI_IO3, 0, 16)>,
-				<NRF_PSEL(QSPI_CSN, 0, 18)>;
+				<NRF_PSEL(QSPI_IO3, 0, 16)>;
+			bias-pull-down;
+		};
+		group2 {
+			psels = <NRF_PSEL(QSPI_CSN, 0, 18)>;
+			bias-pull-up;
 		};
 	};
 
@@ -67,10 +71,14 @@
 				<NRF_PSEL(QSPI_IO0, 0, 13)>,
 				<NRF_PSEL(QSPI_IO1, 0, 14)>,
 				<NRF_PSEL(QSPI_IO2, 0, 15)>,
-				<NRF_PSEL(QSPI_IO3, 0, 16)>,
-				<NRF_PSEL(QSPI_CSN, 0, 18)>;
-			low-power-enable;
+				<NRF_PSEL(QSPI_IO3, 0, 16)>;
+			bias-pull-down;
+		};
+		group2 {
+			psels = <NRF_PSEL(QSPI_CSN, 0, 18)>;
+			bias-pull-up;
 		};
+		low-power-enable;
 	};
 
 	uart1_default: uart1_default {