ipq806x: Added support for compressed dtb images

This commit lays a foundation for packing multiple dtb
images in a single itb image, by supporting compressed dtb
images. This is basically to support all boards across
different soc versions in a single itb image.
The plan is to compress the dtb images, so as to save flash space.

Change-Id: Iba81e311cfda55696209cf99c81e062980629871
Signed-off-by: Gokul Sriram Palanisamy <gpalan@codeaurora.org>
3 files changed