tegra124: Add some make rules which will wrap the bootblock in the BCT.

These rules slip into the normal bootblock preperation process and use the
cbootimage utility to wrap it in a BCT.

TEST=Built for nyan and saw that the new rules were run, and that the BCT
which resulted had reasonable looking contents.

Change-Id: I8cf2a3fb6e9f1d792d536c533d4813acfb550cea
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/170924
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
1 file changed