netbase: Remove persistency MAC script

The machine uses the 'net-persistent-mac' package to provide this
feature and this script were forgot to be removed when moving to
it. While on that, updates the bbapend version to follow OE-Core
upgrade.

Change-Id: I0ef64c4ccec70dfe3e0e038e83abb823b2d2a1a6
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>