stpmic1: program pmic to keep only the debug unit on

Depending on backup register value, we maintain the debug unit
powered-on for debugging purpose.
Only BUCK1 is required for powering the debug unit, so revert
the setting for all the other power lanes, except BUCK3 that
has to be always on.

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