Merge pull request ARMmbed#13584 from ARMmbed/revert-13011-alzix/both-artifacts

Revert "Always build both .hex and .bin files"

Author: 0xc0170

connectivity/libraries/nanostack-libservice/test/libService/unittest/Makefile

@@ -778,15 +778,14 @@ def link_program(self, r, tmp_path, name):
             self.link(elf, objects, libraries, lib_dirs, linker_script)
 
         if self.config.has_regions:
-            stem = join(new_path, "{}_application".format(tail))
+            filename = "{}_application.{}".format(tail, ext)
         else:
-            stem = join(new_path, tail)
-        full_path = "{}.{}".format(stem, ext)
+            filename = "{}.{}".format(tail, ext)
+        full_path = join(new_path, filename)
         if ext != 'elf':
             if full_path and self.need_update(full_path, [elf]):
                 self.progress("elf2bin", tail)
-                self.binary(r, elf, "{}.{}".format(stem, 'bin'))
-                self.binary(r, elf, "{}.{}".format(stem, 'hex'))
+                self.binary(r, elf, full_path)
             if self.config.has_regions:
                 full_path, updatable = self._do_region_merge(
                     tail, full_path, ext