fs: add "dyn_fsync", rm "FSync Control version 1"
The dynamic sync control interface uses Android kernel's unique early
suspend / lat resume interface.

While screen is on, file sync is disabled
when screen is off, a file sync is called to flush all outstanding
writes and restore file sync operation as normal.
Conflicts:
	fs/Kconfig
	fs/sync.c

Backported and modified by pengus77 <ivan@cerrato.biz>