kirkwood-kernel: reset localversion to "-hidav-kirkwood"

The previous commit changed this to "-yocto-standard", which
was not intended.

Signed-off-by: Angelika Tobisch <tobisch@dresearch-fe.de>
submodule: create .gitignore

Do not track files matchin *~ (backup files created by Kate).

Signed-off-by: Angelika Tobisch <tobisch@dresearch-fe.de>