pinctrl: Add st,stm32f469-pinctrl compatible to stm32-pinctrl

Add new compatible for stm32f469 MCU.
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.txt

@@ -9,6 +9,7 @@ Pin controller node:
 Required properies:
  - compatible: value should be one of the following:
    "st,stm32f429-pinctrl"
+   "st,stm32f469-pinctrl"
    "st,stm32f746-pinctrl"
    "st,stm32h743-pinctrl"
  - #address-cells: The value of this property must be 1