sif: pd: Implement Oracle ib_core compliance shared pd

sif: pd: Implement Oracle ib_core compliance shared pd

Orabug: 24713410

shared pd is not an IBTA defined feature, but an Oracle
Linux extension. Even though PSIF can share a pd easily,
it must comply with the Oracle ib_core implementation which
requires a new pd "object" when reusing a pd (via share_pd
verbs).

Without a new pd "object", it causes a NULL pointer deference
during pd clean-up phase. Thus, this patch creates a new pd
"object" when reusing a pd, and this pd "object" is pointing
to the original pd index.

Signed-off-by: Wei Lin Guay <wei.lin.guay@oracle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>