cmd: ubi: export more APIs to public

Export the following functions to public:

- ubi_detach(): this is paired with ubi_part(). One may call this function
  to completely clean up the ubi subsystem after using ubi_part().

- ubi_{create,find,remove}_vol: this is a set of functions for volume
  management.

The original ubi_remove_vol is renamed to __ubi_remove_vol to allow the new
ubi_remove_vol() being used as a wrapper for __ubi_remove_vol() with volume
name.

Also, comments are added for all exported functions.

Reviewed-by: Simon Glass <[email protected]>
Signed-off-by: Weijie Gao <[email protected]>

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