bus: fsl-mc: move fsl_mc_command struct in a uapi header

Define "struct fsl_mc_command" as a structure that can cross the
user/kernel boundary.

Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20210114170752.2927915-2-ciorneiioana@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>