ANDROID: GKI: add more vfs-only exports to their own namespace

When using sdcardfs, some more vfs symbols are needed to be exported to
the filesystem namespace, in order for it to build properly and to
prevent drivers from accessing them.

Like commit 0a77fca3 ("ANDROID: GKI: set vfs-only exports into their
own namespace"), move them to the vfs-only namespace so that builds work
properly.

Bug: 157965270
Bug: 210074446
Bug: 317479303
Change-Id: I915402a03712241bdf48681e3fb46aa33dcff305
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>