xHCI: factor out segments allocation and free function
Factor out the segments allocation and free part from ring allocation and free routines since driver may call them directly when try to expand a ring. Signed-off-by: NAndiry Xu <andiry.xu@amd.com> Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com> Tested-by: NPaul Zimmerman <Paul.Zimmerman@synopsys.com>
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