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In "struct da7280_haptic", the 'legacy' field is unused.
Remove it.

Found with cppcheck, unusedStructMember.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/ac251b456933bcc6fe297b738f9304bd259185c1.1714539865.git.christophe.jaillet@wanadoo.fr

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>