dmaengine: ti: k3-psil: add additional TX threads for j721e

Add matching PSI-L threads mapping for transmission DMA channels
on the J721E platform.

Signed-off-by: Matt Ranostay <mranostay@ti.com>
Link: https://lore.kernel.org/r/20220919205931.8397-2-mranostay@ti.com


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