Reduce complexity when using bifrost roles

We are using two variables which have a similar scope:
- create_image_via_dib
- use_prebuilt_images

We could use one of them and not both. create_image_via_dib is selected
because it also exists in upstream bifrost

use_prebuilt_images = false is the same as create_image_via_dib = true
use_prebuilt_images = true is the same as create_image_via_dib = false

Change-Id: Ieaab78f1dc2d199746a2b13ebc82e9dc615d92e9
Signed-off-by: Manuel Buil <mbuil@suse.com>

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