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cassini-bsp: Reserve memory for SE comm on Corstone-1000

Adam Johnston requested to merge adam.johnston2/meta-cassini:topics/CAS-24/AMPLATFORMS-2409-main into main

The memory used by OpenAMP for communication with the Secure Enclave on the Corstone-1000 is being corrupted at some point after boot. When the PSA APIs are called from Linux, this results in OpenAMP errors from the se-proxy secure partition.

While u-boot should not be accessing this memory region, it's possible that something in Linux is. Explicitly reserve the memory in the u-boot device tree so that the Linux kernel is aware of it.

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