awimage: remove left-over deubg printf

Signed-off-by: Ithamar R. Adema <ithamar@upgrade-android.com>
awimage: more support functions for parsecfg

Signed-off-by: Ithamar R. Adema <ithamar@upgrade-android.com>
awimage: initial support for packing images

awimage now can create .img files from previously unpacked output. No
actual flashing has been attempted yet. All created images are unencrypted,
regardless of the options passed to awimage.

Only supports A10 images for now.

Signed-off-by: Ithamar R. Adema <ithamar@upgrade-android.com>