bus: fsl-mc: export mc_cmd_hdr_read_cmdid() to the fsl-mc bus

Export the mc_cmd_hdr_read_cmdid() function to the entire fsl-mc bus
since it will be needed in the following patch.

Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20210114170752.2927915-3-ciorneiioana@gmail.com


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