dmaengine: owl: Add compatible for the Actions Semi S500 DMA controller

The DMA controller present on the Actions Semi S500 SoC is compatible
with the S900 variant, so add it to the list of devices supported by
the Actions Semi Owl DMA driver. Additionally, order the entries
alphabetically.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/88dc9dc064fd4c71f7ad46f172b05b09b9777e42.1609263738.git.cristian.ciocaltea@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>