pds_fwctl: initial driver framework

Initial files for adding a new fwctl driver for the AMD/Pensando PDS
devices. This sets up a simple auxiliary_bus driver that registers
with fwctl subsystem. It

pds_fwctl: initial driver framework

Initial files for adding a new fwctl driver for the AMD/Pensando PDS
devices. This sets up a simple auxiliary_bus driver that registers
with fwctl subsystem. It expects that a pds_core device has set up
the auxiliary_device pds_core.fwctl

Link: https://patch.msgid.link/r/[email protected]
Reviewed-by: Leon Romanovsky <[email protected]>
Reviewed-by: Dave Jiang <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Shannon Nelson <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

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