arm64: dts: ti: k3-am65-main: Move SA2UL to unused PSI-L thread ID

The first TX and first two RX PSI-L threads for SA2UL are used
by SYSFW on High Security(HS) devices. Use the next available
threads to prevent resource allocation conflicts.

Signed-off-by: Andrew Davis <afd@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Jayesh Choudhary <j-choudhary@ti.com>
Link: https://lore.kernel.org/r/20220823001136.10944-2-afd@ti.com