fix(stm32mp15-fdts): correct MCO2_PLL4 clock name for DHCOM

This clock name was renamed from MCO2_PLL4P to MCO2_PLL4 with the RCC
binding update commit [1]. This file was missed in that update, and the
board fails to compile.

[1]: 52b253bfa2 feat(dt-bindings): new RCC DT bindings

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I215abff1fc275ac1ef6dfb2ac86b9223e6990064
diff --git a/fdts/stm32mp15xx-dhcom-som.dtsi b/fdts/stm32mp15xx-dhcom-som.dtsi
index 12846db..46ef0f0 100644
--- a/fdts/stm32mp15xx-dhcom-som.dtsi
+++ b/fdts/stm32mp15xx-dhcom-som.dtsi
@@ -195,7 +195,7 @@
 		CLK_MCU_PLL3P
 		CLK_RTC_LSE
 		CLK_MCO1_DISABLED
-		CLK_MCO2_PLL4P
+		CLK_MCO2_PLL4
 		CLK_CKPER_HSE
 		CLK_FMC_ACLK
 		CLK_QSPI_ACLK