Revert "g2: mount options to improve performance"

This reverts commit d02f35458a2714cc4d542962418a849c0f9725a8.
g2: mount options to improve performance

* also tidy up fstab

Change-Id: Ia87fd0d52c6dc49f52420a1d78a61e4221a6aee5
Signed-off-by: houstonn <houstonn@gmail.com>