staging: fsl-mc: cleanup: move dpbp and dpcon cmd headers

The dpbp and dpcon cmd header files should not be in the public
include directory but should be private to the bus driver.

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