Remove Support*Demos directories and update sdk.atree

The nyc-support-24.1-dev branch has been successfully moved
ahead of the nyc-mr1-dev branch, so we'll need this to fix
the build.

This reverts commit 52e76badf8842e0c2c8e8145d52cc3f4d465cdd9.

Change-Id: Ib3d6cf5b52f6632854468983d0c2065b1c7e7d8b
974 files changed