Revert "Set recovery fstab to version 2"

This reverts commit 49a7b2c3205871970706de18af6fc8650ef3f4c6.
Revert "Better description for the format of recovery.fstab."

This reverts commit e8fcb10684338bb65331342904770d3a5e9746e4.
Revert "Remove the custom variant of the "ota_from_target_files" script."

This reverts commit 85c038a772cbf39f5bd9a9ba631bf25dd0f1ee14.
Revert "Convert the changes from common-ota_from_target_files.py to a device-specific hook for the "core" ota_from_target_files script."

This reverts commit bbd21082e311961d93b44de71ed1fd5f487d4d77.
Revert "Convert recovery.fstab to the "version 2" format."

This reverts commit 654bcadfb4bd5f33cc48615211539012c8b548b2.