arm64: dts: ti: k3-j7200-main: Add main domain watchdog entries

Add DT entries for main domain watchdog instances.

Signed-off-by: Gowtham Tammana <g-tammana@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20220822235006.7081-1-afd%40ti.com