Revert "ramdisk: fstab: steal mount options from hammerhead"

This reverts commit 5ef9818d28fdbcd63096226eb3fefc26b62e9ee9.

Let's take this a bit slower. Weird issues for some users.
ramdisk: fstab changes part 1

Change-Id: Iff1df27bb444cf09130a260688df5b4e514289a1
ramdisk: fstab changes part 2

Change-Id: I6ee2ab105136618625fcd24fa3edbee1ba7b4cf2