dma: Add stub of dma_memcpy and dma_get_device

Add stub for dma_memcpy() and dma_get_device when CONFIG_DMA is
disabled. This avoids ifdefs in driver code using DMA APIs

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed