ARM: dts: stm32: add LTDC pinctrl on STM32MP13x SoC family
Adds LTDC pinctrl support and assigns dedicated GPIO pins.
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
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