devlink: split out core code

Move core code into a separate file. It's spread around the main
file which makes refactoring and figuring out how devlink works
harder.

Move the xarray, all the most core devlink instance code out like
locking, ref counting, alloc, register, etc. Leave port stuff in
leftover.c, if we want to move port code it'd probably be to its
own file.

Reviewed-by: Jacob Keller <[email protected]>
Reviewed-by: Jiri Pirko <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

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