gfxstream: Remove old include

... no longer needed after the aemu -> gfxstream changes.

Reviewed-by: Marcin Radomski <dextero@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35323>

src/gfxstream/codegen/scripts/cerealgenerator.py

@@ -494,7 +494,6 @@ using DlSymFunc = void* (void*, const char*);
 
 #include "VkSnapshotApiCall.h"
 #include "{self.utilsHeaderDirPrefix}/GfxApiLogger.h"
-#include "aemu/base/files/Stream.h"
 #include "gfxstream/HealthMonitor.h"
 #include "goldfish_vk_private_defs.h"
 """