xhci: remove the unused sw_lpm_support
It is introduced for the pre-0.96 xHC controllers, and the driver only support HW LPM for 1.0 and later controllers.It's not actually used now and is thought not to be used in the future any more, so just remove it. Signed-off-by: NZeng Tao <prime.zeng@hisilicon.com> Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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