nyan: Add bct files for nyan.

There's a config option which selects between the emmc and spi config files
depending on what the firmware is intended to boot from. These are copied from
the files installed by the tegra-bct-nyan ebuild, except that the spi config
file has been modified so that there's only one copy of the BCT and so that it
only has one configuration. This is to save space in the final image.

TEST=With this and other changes, built an image for nyan and saw that the bct
exactly matched what was installed by the tegra-bct-nyan ebuild.

Change-Id: Ibf1b895bb3ed060d394fc6ffcec67b6972bb21e3
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/170923
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
6 files changed