dmaengine: Fix dma_slave_config.dst_addr description

The dst_addr member of the dma_slave_config structure has been mistakenly
marked as ignored if the *source* address belongs to the memory. That is
relevant to the src_addr field of the structure, while the dst_addr field
contains a destination device address that should be ignored if the
destination is the CPU memory.

Correct the @dst_addr description accordingly.

Link: https://lore.kernel.org/r/20230113171409.30470-2-Sergey.Semin@baikalelectronics.ru


Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Vinod Koul <vkoul@kernel.org>