FROMLIST: dt-bindings: Add binding for gunyah hypervisor

The Gunyah Resource Manager applies a devicetree overlay describing the
virtual platform configuration of the guest VM, such as the message
queue capability IDs for communicating with the Resource Manager. This
information is not otherwise discoverable by a VM: the Gunyah hypervisor
core does not provide a direct interface to discover capability IDs nor
a way to communicate with RM without having already known the
corresponding message queue capability ID. Add the DT bindings that
Gunyah adheres for the hypervisor node and message queues.

Bug: 338347082
Link: https://lore.kernel.org/all/20240222-gunyah-v17-2-1e9da6763d38@quicinc.com/


Change-Id: I1825507882eeb299875f2d92e2b861412569a77f
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>