xhci: Read and parse new xhci 1.1 capability register

xhci 1.1 capable controllers have a new HCCPARAMS2 registers
with bits indicating support for new xhci 1.1 capabilities.

Also add support for the new xhci 1.1 bits in the config operational
opertational register that used to be reserved

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
[modified and left out parts not related to HCCPARAMS2 -Mathias]
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>