dmaengine: ti: convert PSIL to be buildable as module

Combine all the SoC specific files into a single lib that can be
built-in or built as a module.

Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20220929234820.940048-4-khilman@baylibre.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>