Add Android/data mounting along with obb mounting in zygote

We should mount Android/data also, not only Android/obb.

Test: After flag is enabled, AdoptableHostTest still pass.
Bug: 148049767
Bug: 150584566
Change-Id: Ie34f08d5764ca3f06577b2fb268c6cffe40f1b52
Merged-In: Ie34f08d5764ca3f06577b2fb268c6cffe40f1b52
(cherry picked from commit 42134404)