In the same way as it's done in pinctrl-cherryview.c we would provide
a readback TX buffer state.

Fixes: 17fab473 ("pinctrl: intel: Set pin direction properly")
Reported-by: N"Bourque, Francis" <francis.bourque@intel.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: N"Bourque, Francis" <francis.bourque@intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>