Revert "Temporarily relax Zygote storage mounting rules."

This reverts commit 9f02b30a723081a20f54ee81a9cca577e36714a6.

This is no longer needed, because we never shipped app storage
sandboxes.

Bug: 130812417
Test: builds
Change-Id: Ia1f51db4904742d2ef15222f2350c67af0dd4a28
1 file changed