xhci: fix port BESL LPM capability checking

xhci: fix port BESL LPM capability checking

commit dcf06a036848b4e8e6c8220f2e00b9adf6f84918 upstream.

Wrong capability bit was checked for best effort service latency.
bit 20 indicate port is BESL LPM capable (BLC),
bit 19 is hardware LPM capable (HLC)

This patch should be backported to kernels as old as 3.11, that
contain the commit a558ccdcc71c7770c5e80c926a31cfe8a3892a09 "usb: xhci:
add USB2 Link power management BESL support"

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Reported-by: Steve Cotton <steve@s.cotton.clara.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>