dt-bindings: pinctrl: Remove bindings for Intel Thunderbay pinctrl driver

Remove Thunder Bay specific code as the product got cancelled
and there are no end customers or users.

Signed-off-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>
Link: https://lore.kernel.org/r/20230403120235.939-2-lakshmi.sowjanya.d@intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: Lakshmi-Sowjanya

Documentation/devicetree/bindings/pinctrl/intel,pinctrl-thunderbay.yaml

@@ -16598,11 +16598,6 @@ L:	linux-omap@vger.kernel.org
 S:	Maintained
 F:	drivers/pinctrl/pinctrl-single.c
 
-PIN CONTROLLER - THUNDERBAY
-M:	Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>
-S:	Supported
-F:	drivers/pinctrl/pinctrl-thunderbay.c
-
 PIN CONTROLLER - SUNPLUS / TIBBO
 M:	Dvorkin Dmitry <dvorkin@tibbo.com>
 M:	Wells Lu <wellslutw@gmail.com>