vendor_init: allow stat() of /data dir

avc: denied { getattr } for path="/data" scontext=u:r:vendor_init:s0
tcontext=u:object_r:system_data_file:s0 tclass=dir permissive=1

Bug: 78345561
Test: build/boot device. Denial is gone.
Change-Id: Ie858f1fe65aeb1845b00a5143c345e81aa2ec632