ARM: dts: stm32: Reinstate missing root oscillators on STM32MP15xx

The root oscillators reference used to be in rcc node since
3d15245502c4 ("ARM: dts: stm32mp1: explicit clock reference needed by RCC clock driver")
however this is not part of upstream stm32mp151.dtsi . The
RCC driver does need this reference, reinstate it globally.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Tested-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/arch/arm/dts/stm32mp15-u-boot.dtsi b/arch/arm/dts/stm32mp15-u-boot.dtsi
index 66d4c40..3f57bd5 100644
--- a/arch/arm/dts/stm32mp15-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp15-u-boot.dtsi
@@ -186,6 +186,9 @@
 	bootph-all;
 	#address-cells = <1>;
 	#size-cells = <0>;
+	clock-names = "hse", "hsi", "csi", "lse", "lsi";
+	clocks = <&clk_hse>, <&clk_hsi>, <&clk_csi>,
+		 <&clk_lse>, <&clk_lsi>;
 };
 
 &usart1 {