We are shipping different reset_button function in Turris Shield and
Turris MOX. We can not have it in one generic file as it leads to this
issue:

/etc/hotplug.d/button/mox_reset: mox-support (existing-file), mox-generic-support (new-file)

So, ship reset_button in specific support packages instead of generic
one.

Fixes: 26fba930 ("nor-update: Generalize
to work for all devices")