dmaengine: ti: k3-psil-j721e: Add entry for CSI2RX

The CSI2RX subsystem uses PSI-L DMA to transfer frames to memory. It can
have up to 32 threads per instance. J721E has two instances of the
subsystem, so there are 64 threads total. Add them to the endpoint map.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>