Driver: add new error code to cpuconf

Author: ayla-nordicsemi

include/zephyr/drivers/firmware/nrf_ironside/cpuconf.h

@@ -16,6 +16,7 @@
  * @{
  */
 
+#define IRONSIDE_CPUCONF_ERROR_NO_FIRMWARE              0x5eb3
 #define IRONSIDE_CPUCONF_ERROR_WRONG_CPU                0x5eb2
 #define IRONSIDE_CPUCONF_ERROR_MEM_ACCESS_NOT_PERMITTED 0x5eb1