Run fsync tests on mutable filesystem.

The purpose of those tests is to ensure fsync succeeds for
directories. However, they try to call fsync for / (the root
filesystem) that is usually mounted read-only, which does not
make sense because the whole point of fsync is to flush
uncommitted changes to the filesystem.

In fact, some well-known read-only filesystems (e.g. squashfs)
does not support fsync, so these tests fail if we use such
filesystems as the root filesystem.

This patch changes the tests to call fsync against /data
instead. /data is a user data partition and should be always
mounted read-write.

Bug: 28681455

(cherry picked from commit cfa3262c)

Change-Id: I3e50f7b6ef07e96138711eef1f678f90cc9eb632