dmaengine: imx-sdma: Correct src_addr_widths and directions

The driver already supports DMA_DEV_TO_DEV in sdma_config(),
DMA_SLAVE_BUSWIDTH_2_BYTES and DMA_SLAVE_BUSWIDTH_1_BYTE in
sdma_prep_slave_sg(). So this patch adds them to the lists.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
Signed-off-by: Srikanth Krishnakar <Srikanth_Krishnakar@mentor.com>