bus/fsl-mc: Do no longer export the total number of irqs outside dprc_scan_objects

bus/fsl-mc: Do no longer export the total number of irqs outside dprc_scan_objects

The total number of interrupts is only used for some checks
outside the dprc_scan_objects function. Furthermore, in some
situations the check is made twice. Move the bounds check inside
the function for all situations.

Reviewed-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
Link: https://lore.kernel.org/r/20200929085441.17448-2-diana.craciun@oss.nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>