ARM: dts: stm32: add bootph-all for dsi node in stm32f769-disco-u-boot

Add bootph-all for dsi node in stm32f769-disco-u-boot.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/arch/arm/dts/stm32f769-disco-u-boot.dtsi b/arch/arm/dts/stm32f769-disco-u-boot.dtsi
index 8413264..f677bb9 100644
--- a/arch/arm/dts/stm32f769-disco-u-boot.dtsi
+++ b/arch/arm/dts/stm32f769-disco-u-boot.dtsi
@@ -30,6 +30,7 @@
 		 <&rcc 0 STM32F7_APB2_CLOCK(LTDC)>,
 		 <&clk_hse>;
 	clock-names = "pclk", "px_clk", "ref";
+	bootph-all;
 };
 
 &fmc {