Remove everything from this branch to save drive space

There currently doesn't seem to be a way to have a local manifest just
remove a single directory.  A way to get around this is to check out
an empty repository, so create one.  This allows us to remove several
copies of edk2 that are currently pulled into the tree, saving 750MB to
1GB.

BUG=None
BRANCH=None
TEST=create a local manifest and add the following lines:
<manifest>
<!-- Don't download all the other copies of EDK2 -->
  <extend-project name="chromiumos/third_party/edk2"
                  groups="firmware"
                  path="src/third_party/fsp/cml/edk2/branch1"
                  revision="refs/heads/empty" />
  <extend-project path="src/third_party/fsp/cnl/edk2"
                  groups="firmware"
                  name="chromiumos/third_party/edk2"
                  revision="refs/heads/empty" />
  <extend-project path="src/third_party/fsp/glk/edk2"
                  groups="firmware"
                  name="chromiumos/third_party/edk2"
                  revision="refs/heads/empty" />
  <extend-project path="src/third_party/fsp/icl/edk2"
                  groups="firmware"
                  name="chromiumos/third_party/edk2"
                  revision="refs/heads/empty" />
  <extend-project path="src/third_party/amd-firmware/binarypi/picasso-pi/edk2"
                  groups="firmware"
                  name="chromiumos/third_party/edk2"
                  revision="refs/heads/empty" />
</manifest>

Change-Id: Idb6fd38dffaa684d24b8f0ed328f8c892cd77c5d
Signed-off-by: Martin Roth <martinroth@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/edk2/+/1881223
2651 files changed
tree: 4b825dc642cb6eb9a060e54bf8d69288fbee4904

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