filelock: add FL_RECLAIM to show_fl_flags() macro

Show the FL_RECLAIM flag symbolically in tracepoints.

Fixes: bb0a55bb ("nfs: don't allow reexport reclaims")
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/20250903-filelock-v1-1-f2926902962d@kernel.org


Signed-off-by: Christian Brauner <brauner@kernel.org>