binder: add t->is_async and t->is_reply

Replace the t->need_reply flag with the more descriptive t->is_async and
and t->is_reply flags. The 'need_reply' flag was only used for debugging
purposes and the new flags can be used to distinguish between the type
of transactions too: sync, async and reply.

For now, only update the logging in print_binder_transaction_ilocked().
However, the new flags can be used in the future to replace the current
patterns and improve readability. e.g.:

  - if (!reply && !(tr->flags & TF_ONE_WAY))
  + if (t->is_async)

This patch is in preparation for binder's generic netlink implementation
and no functional changes are intended.

Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20250727182932.2499194-3-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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