tegra124: Switch the bootblock over the ARMv4 impelementation.

The bootblock for the tegra124 runs on the AVP coprocessor which uses the
ARMv4 architecture. Switch it over to that architecture.

TEST=Built and booted into the bootblock on nyan. Built for link, snow, pit,
and falco.

Change-Id: Ie527bbff938e6148c58727d448f9c2e6862da872
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/171402
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
2 files changed