ARM: dts: stm32mp1: move FDCAN to PLL4_R

LTDC modifies the clock frequency to adapt it to the display. Such
frequency change is not detected by the FDCAN driver that instead
cache the value at probe and pretend to use it later.

Keep the LTDC alone on PLL4_Q by moving the FDCAN to PLL4_R.

Signed-off-by: Antonio Borneo <antonio.borneo@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi b/arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi
index 320912e..21aa4bf 100644
--- a/arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi
@@ -142,7 +142,7 @@
 		CLK_UART6_HSI
 		CLK_UART78_HSI
 		CLK_SPDIF_PLL4P
-		CLK_FDCAN_PLL4Q
+		CLK_FDCAN_PLL4R
 		CLK_SAI1_PLL3Q
 		CLK_SAI2_PLL3Q
 		CLK_SAI3_PLL3Q