dmaengine device should explicitly call devm_free_irq() when using
devm_request_irq().

The irq is still ON when devices remove is executed and irq should be
quiesced before remove is completed.
Signed-off-by: NVinod Koul <vinod.koul@intel.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>