WIP: CWM recovery fstab features.

Change-Id: Ibb4c910ab7f3c377a8f358214d58357c40d5811a
fs_mgr: add support for "sync" mount flag

Change-Id: I6ad74cfbf98d30320785e3691df30dabc5c54cb9
fs_mgr.c: fix i++ error and optimize code

Change-Id: I4d7c9846143ec5b9f76af42c7ee4d5a7c2a3fd6d