devicetree: Rename unused parameter max in domain_scan_bus()

For the PCI root node, input parameter max==0 and output value
max is not relevant for operation.

Change-Id: I23adab24aa957c4d51d703098a9a40ed660b4e6c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/8855
Tested-by: build bot (Jenkins)
Reviewed-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
4 files changed