powerpc/secvar: Extend sysfs to include config vars

The forthcoming pseries consumer of the secvar API wants to expose a
number of config variables.  Allowing secvar implementations to provide
their own sysfs attributes makes it easy for consumers to expose what
they need to.

This is not being used by the OPAL secvar implementation at present, and
the config directory will not be created if no attributes are set.

Signed-off-by: Russell Currey <[email protected]>
Co-developed-by: Andrew Donnellan <[email protected]>
Signed-off-by: Andrew Donnellan <[email protected]>
Reviewed-by: Stefan Berger <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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