drm/gma500: Uninstall interrupts on driver removal

Reloading the driver revealed that the interrupt handler never got
uninstalled.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220322131742.11566-2-patrik.r.jakobsson@gmail.com