write option byte: final refactor

now that all flash family methods are aligned, refactor
main method to avoid duplicated lock/unlock, add info traces, and
map methods based on familly instead of a small subset of selected
devices.

nb1: f0/f1 support is still missing

nb2: option read/write is still conditioned by presence of option_base
and option_size in chipid.c, but adding more chips should only be
a matter of adding these two informations.