dmaengine: dma-jz4780: add missed clk_disable_unprepare in remove

The remove misses to disable and unprepare jzdma->clk.
Add a call to clk_disable_unprepare to fix it.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Acked-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20191104161622.11758-1-hslester96@gmail.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>