dmaengine: ti: k3-psil: add additional TX threads for j7200

commit 1b0f46a241a7d483976ae07475de380488f77378 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git

Add matching PSI-L threads mapping for transmission DMA channels
on the J7200 platform.

Signed-off-by: Matt Ranostay <mranostay@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>