boot: zephyr: Update changed Nordic family Kconfig

Updates a Kconfig that was renamed

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>
diff --git a/boot/zephyr/Kconfig b/boot/zephyr/Kconfig
index fc211c3..b422625 100644
--- a/boot/zephyr/Kconfig
+++ b/boot/zephyr/Kconfig
@@ -199,7 +199,7 @@
 
 config BOOT_PREFER_SWAP_MOVE
 	bool "Prefer the newer swap move algorithm"
-	default y if SOC_FAMILY_NRF
+	default y if SOC_FAMILY_NORDIC_NRF
 	default y if !$(dt_nodelabel_enabled,scratch_partition)
 	help
 	  If y, the BOOT_IMAGE_UPGRADE_MODE will default to using
@@ -661,13 +661,13 @@
 config BOOT_WATCHDOG_FEED
 	bool "Feed the watchdog while doing swap"
 	default y if WATCHDOG
-	default y if SOC_FAMILY_NRF
+	default y if SOC_FAMILY_NORDIC_NRF
 	# for nRF nrfx based implementation is available
-	imply NRFX_WDT if SOC_FAMILY_NRF
-	imply NRFX_WDT0 if SOC_FAMILY_NRF
-	imply NRFX_WDT1 if SOC_FAMILY_NRF
-	imply NRFX_WDT30 if SOC_FAMILY_NRF
-	imply NRFX_WDT31 if SOC_FAMILY_NRF
+	imply NRFX_WDT if SOC_FAMILY_NORDIC_NRF
+	imply NRFX_WDT0 if SOC_FAMILY_NORDIC_NRF
+	imply NRFX_WDT1 if SOC_FAMILY_NORDIC_NRF
+	imply NRFX_WDT30 if SOC_FAMILY_NORDIC_NRF
+	imply NRFX_WDT31 if SOC_FAMILY_NORDIC_NRF
 	help
 	  Enables implementation of MCUBOOT_WATCHDOG_FEED() macro which is
 	  used to feed watchdog while doing time consuming operations.
@@ -721,7 +721,7 @@
 config MULTITHREADING
 	default y if BOOT_SERIAL_CDC_ACM #usb driver requires MULTITHREADING
 	default y if BOOT_USB_DFU_GPIO || BOOT_USB_DFU_WAIT
-	default n if SOC_FAMILY_NRF
+	default n if SOC_FAMILY_NORDIC_NRF
 	default n if SOC_FAMILY_ESPRESSIF_ESP32 && MCUBOOT
 	default y