dt-bindings: pinctrl: Add st,stm32f769-pinctrl compatible to stm32-pinctrl

Add new compatible for stm32f769 MCU.
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
Reviewed-by: Rob Herring <robh@kernel.org>

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

@@ -11,6 +11,7 @@ Required properies:
    "st,stm32f429-pinctrl"
    "st,stm32f469-pinctrl"
    "st,stm32f746-pinctrl"
+   "st,stm32f769-pinctrl"
    "st,stm32h743-pinctrl"
    "st,stm32mp157-pinctrl"
    "st,stm32mp157-z-pinctrl"