libelf/elf_addrenv_free(): Don't instantiate address environment prior to destroying it

Same as with group_free(), there is no need to instantiate the address
environment to destroy it.

The only problem was the ARM implementation modified the L1 mappings
in up_addrenv_destroy(), which it no longer does.

binfmt/libelf/libelf_addrenv.c

@@ -259,9 +259,7 @@ void elf_addrenv_free(FAR struct elf_loadinfo_s *loadinfo)
 
   /* Free the address environment */
 
-  elf_addrenv_select(loadinfo);
   ret = up_addrenv_destroy(&loadinfo->addrenv);
-  elf_addrenv_restore(loadinfo);
   if (ret < 0)
     {
       berr("ERROR: up_addrenv_destroy failed: %d\n", ret);