arm64: dts: ti: k3-am64-main: Add RTI watchdog nodes

Add the needed bus mappings for the two main RTI memory ranges and
the required device tree nodes in the main domain.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-By: Hari Nagalla <hnagalla@ti.com>
Link: https://lore.kernel.org/r/20220111134552.800704-1-christian.gmeiner@gmail.com


Signed-off-by: Nishanth Menon <nm@ti.com>