powerpc/machdep: Define 'compatibles' property in ppc_md and use it

Most probe functions that do not use the 'compatible' string do
nothing else than checking whether the machine is compatible with
one of the strings in a NULL terminated table of strings.

Define that table of strings in ppc_md structure and check it directly
from probe_machine() instead of using ppc_md.probe() for that.

Keep checking in ppc_md.probe() only for more complex probing.

All .compatible could be replaced with a single element NULL
terminated list but that's not worth the churn. Can be do incrementaly
in follow-up patches.

Signed-off-by: Christophe Leroy <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/[email protected]

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