Revert "Reland: Use "gfxstream" namespace" am: 222fce4751

Original change: https://android-review.googlesource.com/c/platform/external/gfxstream-protocols/+/2515935

Change-Id: I292c416d319c8c19fefa77bcf572e6c566ecf44a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>