staging: fsl-mc: move resource pool init/cleanup into allocator

The resource pool init/cleanup functions logically belong in the
allocator.  Move them to the allocator and rename to reflect the
move out of the dprc-driver.

Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>