Settings: display light pulse dialog settings conditionally

If the device doesn't support LED pulsing, don't show the settings.

REF: CYNGNOS-403
Change-Id: I2316a4fd7a3a27c9bc046eda3bd374acc1edcf37
Signed-off-by: Roman Birg <roman@cyngn.com>
(cherry picked from commit a49625ac)