Revert "Use "gfxstream" namespace"

Revert submission 2496226-gfxstream-use-gfxstream-namespace

Reason for revert: b/275924600
Reverted changes: /q/submissionid:2496226-gfxstream-use-gfxstream-namespace

Change-Id: Icb04f0ab33d2183422483da27126a98adb0d835e
4 files changed