dmaengine: Add devm_dma_request_chan() Expand the arsenal of devm functions for DMA devices, this time for requesting channels. Signed-off-by: Bence Csókás <csokas.bence@prolan.hu> Link: https://lore.kernel.org/r/20250610082256.400492-2-csokas.bence@prolan.hu Signed-off-by: Vinod Koul <vkoul@kernel.org>