avoid 03/05 intel-hex records for nordics devices

use Intelhex::write_hex_file instead of IntelHex::tofile

Author: nvlsianpu

tools/targets/__init__.py

@@ -490,7 +490,7 @@ def binary_hook(t_self, resources, _, binf):
             binh.merge(blh)
 
         with open(binf.replace(".bin", ".hex"), "w") as fileout:
-            binh.tofile(fileout, format='hex')
+            binh.write_hex_file(fileout, write_start_addr=False)
 
 class NCS36510TargetCode:
     @staticmethod