apt-native: don't let dpkg overwrite files by default

With --force-overwrite (implied by --force-all), dpkg will not abort
when a package overwrites files from different packages. As this can
also lead to "The following package disappeared from your system as
all files have been overwritten by other packages: <package>" and
subsequently broken dependencies, this makes the simple case of
conflicting files hard to debug.

Instead of finding all possibly required force options, only disable
overwrite for now.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>