feat(stm32mp2-fdts): describe stpmic2 power supplies

Describe PMIC power supplies in STM32MP257F-EV1 board DT file.

Change-Id: I14df5d210909d95b2164197eb910a9ea0aa0b51d
Signed-off-by: Pascal Paillet <p.paillet@st.com>
1 file changed