FROMLIST: gendwarfksyms: order -T symtypes output by name

When writing symtypes information, we iterate through the entire hash
table containing type expansions. The key order varies unpredictably
as new entries are added, making it harder to compare symtypes between
builds.

Resolve this by sorting the type expansions by name before output.

Signed-off-by: Giuliano Procida <gprocida@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>

Bug: 400972353
Link: https://lore.kernel.org/lkml/20250625095215.4027938-1-gprocida@google.com/


Change-Id: Icb2d0ec4a22593c59b43816a009ac19ed1e3e3bb
Signed-off-by: Giuliano Procida <gprocida@google.com>