staging: unisys: visornic: enhance visornic to use channel_interrupt

visornic uses timer to check the response queue and drain
it if needed periodically. On the other hand, visorbus
provides periodic work to serve such request, therefore,
timer should be replaced by channel_interrupt.

Signed-off-by: Song Chen <chensong_2000@189.cn>
Link: https://lore.kernel.org/r/1610439940-5590-1-git-send-email-chensong_2000@189.cn


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>