pncconf -add a chargepump stepgen option

The gecko G540 requires a chargepump.
This is based on Peter's forum example for the G540x2 firemware
French doc. update

Signed-off-by: Francis Tisserant <tissf@free.fr>
French doc. update

Signed-off-by: Francis Tisserant <tissf@free.fr>
French doc. update

Signed-off-by: Francis Tisserant <tissf@free.fr>
French doc. update

Signed-off-by: Francis Tisserant <tissf@free.fr>