tegra124: Add a stub implementation of the tegra124 SOC.

Most things still needs to be filled in, but this will allow us to build
boards which use this SOC.

TEST=With this and other changes, built for the nyan board.

Change-Id: Ic790685a78193ccb223f4d9355bd3db57812af39
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/170836
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
10 files changed