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: Ic9855dc4948ad92a6416a6ee10e580d3ddbf85bd
46 files changed