shmem: Support user.* xattr in tmpfs

Mount tmpfs on /data with tmpfs in production mode

Issue: FP4-263
Issue: FP4-INT#2
Change-Id: Ib7375478971c75a1f6cfb8c7e22a5797161ce89f
(cherry picked from commit f3d50203c0dee9876be2a5bfab54361e253d50b5)
1 file changed