bus: fsl-mc: mc-io: Correct misdocumentation of 'dpmcp_dev' param

Fixes the following W=1 kernel build warning(s):

 drivers/bus/fsl-mc/mc-io.c:70: warning: Function parameter or member 'dpmcp_dev' not described in 'fsl_create_mc_io'

Cc: Stuart Yoder <stuyoder@gmail.com>
Reviewed-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210617110500.15907-8-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/bus/fsl-mc/mc-io.c

@@ -55,7 +55,7 @@ static void fsl_mc_io_unset_dpmcp(struct fsl_mc_io *mc_io)
  * @dev: device to be associated with the MC I/O object
  * @mc_portal_phys_addr: physical address of the MC portal to use
  * @mc_portal_size: size in bytes of the MC portal
- * @dpmcp-dev: Pointer to the DPMCP object associated with this MC I/O
+ * @dpmcp_dev: Pointer to the DPMCP object associated with this MC I/O
  * object or NULL if none.
  * @flags: flags for the new MC I/O object
  * @new_mc_io: Area to return pointer to newly created MC I/O object