drm/gma500: Move asle interrupt work into a work task
Previously the backlight code was called from IRQ context which isn't allowed. This patch moves all the asle work into a work task which takes care of the locking bug reported by users. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=64221Signed-off-by: NPatrik Jakobsson <patrik.r.jakobsson@gmail.com>
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