commit a6615937 upstream.

According to USB 2.0 ECN Errata for Link Power
Management (USB2-LPM-Errata-final.pdf), BESL
must be enabled if LPM is enabled.

This helps with USB30CV TD 9.21 LPM L1
Suspend Resume Test.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Cc: Du, Changbin <changbin.du@intel.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>