p505: Apply changes from p500

between
 Cleanup SD Card mounting (805892c8b7ed951cc09c271a238460dbb33a3210)
and
 p500: Fix fstab after kitkat merge (2df4e29e05deaf6300131b3bfed5334a958950b5)

Change-Id: I5b9abfdea751b317dd1e2ff7bab9d0868b199fb1
p505: Fix fstab after kitkat merge

Change-Id: Ibf7e4820c09ca1fd65f2094bd4ed1f3a7e58078d