lib: utils/mpxy: bind channel access to owning domainHEADmaster

The MPXY framework currently stores registered channels in a global
list and exposes them to all callers. However, the intended model is
that each channel is assigned to a single supervisor domain at boot and
remains owned by that domain for its lifetime.

Introduce fixed owner-domain tracking in struct sbi_mpxy_channel and
make channel lookup and enumeration domain-aware. A channel is now
visible only when accessed from its owning domain. Also require the
owner to be set before channel registration.

This allows MPXY to support systems where the same hart may be reused by
multiple domains while keeping channel ownership and visibility fixed to
the domain that owns the service.

Signed-off-by: Oza Pawandeep <[email protected]>
Reviewed-by: Rahul Pathak <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

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