platform/x86: fujitsu-laptop: use a sparse keymap for brightness key events
Simplify brightness key event generation by using a sparse keymap. Signed-off-by: NMichał Kępień <kernel@kempniu.pl> Reviewed-by: NJonathan Woithe <jwoithe@just42.net> Signed-off-by: NDarren Hart (VMware) <dvhart@infradead.org>
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