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/include/io/io.h b/boot/zephyr/include/io/io.h
index 145530b..563281f 100644
--- a/boot/zephyr/include/io/io.h
+++ b/boot/zephyr/include/io/io.h
@@ -21,7 +21,7 @@
 
 #include <stddef.h>
 
-#ifdef CONFIG_SOC_FAMILY_NRF
+#ifdef CONFIG_SOC_FAMILY_NORDIC_NRF
 #include <helpers/nrfx_reset_reason.h>
 #endif
 
@@ -62,7 +62,7 @@
  */
 bool io_detect_boot_mode(void);
 
-#ifdef CONFIG_SOC_FAMILY_NRF
+#ifdef CONFIG_SOC_FAMILY_NORDIC_NRF
 static inline bool io_boot_skip_serial_recovery()
 {
     uint32_t rr = nrfx_reset_reason_get();