Move the NXP DPIO (Datapath I/O Driver) out of the
drivers/staging directory and into the drivers/soc/fsl directory.

The DPIO driver enables access to Queue and Buffer Manager (QBMAN)
hardware on NXP DPAA2 devices. This is a prerequisite to moving the
DPAA2 Ethernet driver out of staging.
Signed-off-by: NRoy Pledge <roy.pledge@nxp.com>
Reviewed-by: NHoria Geantă <horia.geanta@nxp.com>
Reviewed-by: NIoana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: NLi Yang <leoyang.li@nxp.com>