Fixes new kernel-doc warning in input-mt.c:

Warning(drivers/input/input-mt.c:38): No description found for parameter
'flags'
Reported-by: NRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: NHenrik Rydberg <rydberg@euromail.se>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>