USBPHYC ports require 3 supplies: 3v3, 1v1 and 1v8.
This patch adds the corresponding properties to usbphyc ports on
stm32mp157c-ed1 board.
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>