ARM: dts: stm32: Add vrefbuf support to stm32mp157c
stm32mp157c has vrefbuf regulator that can provide analog reference voltage from 1500mV to 2500mV. Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: NAlexandre Torgue <alexandre.torgue@st.com>
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