fstab: revert to original mount options for system partition

Those changes I made to mount options during bring up weren't actually needed
and they seem to cause problems with other devices.

Change-Id: Ice28773fd2c918a284d40f758296496e27599155
ramdisk: ditch remount.glacier (no longer remounting system after boot)

Change-Id: Ic9ab367eb05cddfb75d7dc4c50a06b00af7d47a1