arm64: dts: ti: k3-am62-phycore-som: Reserve RTOS IPC memory

Reserve a portion of memory for inter-processor communication between
all remote processors running RTOS or baremetal firmware.
Move ramoops to lower region so the IPC fits to the correct address.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Link: https://lore.kernel.org/r/20250131093531.1054924-2-w.egorov@phytec.de


Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>