image-resin.bbclass: No need for boot files list anymore
image-resin.bbclass: No need for boot files list anymore

The hooks are running now in the container of the next hostOS so there is no
need for a list of boot files anymore. They will get deployed from /resin-boot
to /mnt/boot in a temporary container from the next hostOS image.

Signed-off-by: Andrei Gherzan <8dc7c09356db0b1762fb140617d7375c0a5a4131@resin.io>

resin-os/meta-resin,resin-os/meta-resin,resin-os/meta-resin,resin-os/meta-resin