regulator: stpmu1: update buck1 range

SW impact for Rev 1.2 of STPMIC1 in U-Boot:
Buck converters output voltage change for Buck1
=> Vdd min 0,725 to max 1,5V instead of 0.6V to 1.35V
   (see STPMIC1 datasheet / chapter 5.3 Buck converters)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
1 file changed