dmaengine: ti: k3-psil-am62a: Fix SPI PDMA data

AM62Ax has 3 SPI channels where each channel has 4x TX and 4x RX
threads. Also fix the thread numbers to match what the firmware expects
according to the PSI-L device description.

Link: http://downloads.ti.com/tisci/esd/latest/5_soc_doc/am62ax/psil_cfg.html [1]
Fixes: aac6db7e

 ("dmaengine: ti: k3-psil-am62a: Add AM62Ax PSIL and PDMA data")
Signed-off-by: Jai Luthra <j-luthra@ti.com>
Link: https://lore.kernel.org/r/20231123-psil_fix-v1-1-6604d80819be@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>