arm64: dts: ti: k3-am67a-beagley-ai: Add remote processor nodes

Add nodes for the R5F and C7x cores on the SoC. This includes the mailbox
and memory carveouts used by these remote cores.

Signed-off-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20241203174114.94751-2-afd@ti.com


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