tegra124: Override the -march flag used by the bootblock.

The bootblock on the tegra124 runs on the AVP which is uses the armv4t
architecture version.

TEST=With this option set, saw that the compiler no longer emitted
instructions which don't work on the AVP.

Change-Id: Ic9c8b34a353e291a02a714d18de0d01f1e3ab4d1
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/170996
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
1 file changed