dmaengine: at_xdmac: align properly function members

Align properly function members.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20221117131547.293044-3-claudiu.beznea@microchip.comSigned-off-by: Vinod Koul <vkoul@kernel.org>