lsusb: Fix bug in USB 2.0 extended caps descriptor.

The upper bits of the USB 2.0 extended capability BOS descriptor weren't
being shifted into the right byte position.  That didn't matter much
before now, but some USB 2.1 devices will soon have a modified BOS
descriptor that has BESL values in those upper bits.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>