dmaengine: tegra-apb: Remove unused function argument

Remove unused function argument from handle_continuous_head_request().

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/20200209163356.6439-19-digetx@gmail.com


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