ARM: dts: stm32: Describe Vin power supply on stm32mp157c-edx board

Add description for Vin power supply and for peripherals that
are supplied by Vin.

Signed-off-by: Pascal Paillet <p.paillet@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
1 file changed