qlcnic: change module parameter permissions

o Updating module parameter after driver load is not supported
  except auto_fw_reset parameter. Changing these parameter after
  driver load, can have weird result.

o Update driver version to 5.0.15.

Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>