[sdk] Fix include_base Fixes include_base for cgptlib/include so that the include dir in meta.json is consistent with actual include dir Bug: b/269166466 Change-Id: I5f22a2842a25a201d54a388f4c610fa413688c13 Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/vboot_reference/+/839378 Reviewed-by: David Pursell <dpursell@google.com>