Revert "Reland: Use "gfxstream" namespace" am: 222fce4751 am: 4d513da92c

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

Change-Id: Ie424f64eb2f81bafc215757f476b640794a6fd45
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>