xhci: move the common code to a function to get max ports and port array
There are several functions using same code to get max ports and port array, this patch moves the common code to a function in order to reuse them easily. Signed-off-by: NHuajun Li <huajun.li.lee@gmail.com> Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
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