[helpers] add_new_device.sh is actually a bash script

Signed-off-by: Philippe De Swert <philippe.deswert@jollamobile.com>
[all][helpers] hadk-friendly patterns header

Signed-off-by: Simonas Leleiva <simonas.leleiva@jollamobile.com>
[hammerhead][patterns] switch to flat patterns

Signed-off-by: Simonas Leleiva <simonas.leleiva@jollamobile.com>