devicetree: Add version checks

This patch adds a few more sanity checks to the FDT header parsing to
make sure that our code can support the version that is passed in.

BRANCH=None
BUG=None
TEST=Booted Kevin.

Change-Id: Ia4778668e676ddb3ed84d90282cecf85a62a5ead
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1536384
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
3 files changed