sepolicy: Add label to userdata file node

The userdata file node should be labeled to
avoid avc denied.

Bug: 171760673
Bug: 177364376
Test: build pass
Signed-off-by: Randall Huang <huangrandall@google.com>
Change-Id: I9ba89c75c120864c64ea278934b15edc3ba18a6c
6 files changed