FROMLIST: virt: gunyah: Share guest VM dtb configuration to Gunyah

Gunyah Resource Manager sets up a virtual machine based on a device tree
which lives in guest memory. Resource manager requires this memory to be
provided as a memory parcel for it to read and manipulate. Construct a
memory parcel, lend it to the virtual machine, and inform resource
manager about the device tree location (the memory parcel ID and offset
into the memory parcel).

Bug: 338347082
Link: https://lore.kernel.org/all/20240222-gunyah-v17-26-1e9da6763d38@quicinc.com/


Change-Id: I246f51ca59b17e7a59355b52da5173e57c8f68a1
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>