dmaengine: at_hdmac: Use devm_platform_ioremap_resource

Use devm_platform_ioremap_resource() helper for cleanner code and easier
resource management.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com
Link: https://lore.kernel.org/r/20221025090306.297886-24-tudor.ambarus@microchip.com


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