Revert "Use "gfxstream" namespace" am: 5d733516cb

Original change: https://android-review.googlesource.com/c/platform/external/gfxstream-protocols/+/2514001

Change-Id: I0e3fac15c226082d4e1b2a9d6e749231b39414b7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>