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
1 file changed