fpga: dfl: factor out feature device registration

Add separate functions, feature_dev_{register,unregister}(), that wrap
platform_device_add() and platform_device_unregister(), respectively.
These are invoked once per feature device in this commit but will be
reused in a subsequent commit to destroy and recreate the platform
device when the corresponding port is released and reassigned.

The function feature_dev_register() will be extended in subsequent
commits to allocate the platform device, add resources and platform
data, and finally add the platform device to the device hierarchy.

Signed-off-by: Peter Colberg <[email protected]>
Reviewed-by: Matthew Gerlach <[email protected]>
Reviewed-by: Basheer Ahmed Muddebihal <[email protected]>
Acked-by: Xu Yilun <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Xu Yilun <[email protected]>

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