scripts: Prefer objdump --syms over -t in scripts

objdump --syms is a bit more self-documenting.

The other uses of objdump already use the long forms (--dwarf=rawline,
--dwarf=info).

scripts/code.py

@@ -228,7 +228,7 @@ def collect_syms(obj_path, sections=None, global_=False, *,
 
     # find symbol addresses and sizes
     syms = []
-    cmd = objdump_path + ['-t', obj_path]
+    cmd = objdump_path + ['--syms', obj_path]
     if args.get('verbose'):
         print(' '.join(shlex.quote(c) for c in cmd))
     proc = sp.Popen(cmd,