dmaengine: mv_xor: match alloc_wc and free_wc

dma_alloc_wc is used but not dma_free_wc.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://lore.kernel.org/r/20250821220942.10578-1-rosenp@gmail.com


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