lib: sbi_mpxy: Change MPXY state as per-domain data

OpenSBI supports multiple supervisor domains run on same platform. When
these supervisor domains want to communicate with OpenSBI through MPXY
channels, they will allocate MPXY shared memory from their own memory
regions. Therefore, the MPXY state data structure must be per-domain and
per-hart data structure.

This commit registers per-domain MPXY state data in sbi_mpxy_init(). The
original MPXY state allocated in scratch region is also removed. We also
replace sbi_scratch_thishart_offset_ptr() macro as new
sbi_domain_mpxy_state_thishart_ptr() macro which gets MPXY state from
per-domain data.

Signed-off-by: Alvin Chang <[email protected]>
Reviewed-by: Yu-Chien Peter Lin <[email protected]>
Reviewed-by: Samuel Holland <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

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