Introduce FSYNC_ASYNC

Revert "fs/dyn_sync_cntrl: dynamic sync control 1.6 for OPO"

This reverts commit d9c9bee460dbd060c1bde843768cf889c263f142.

Revert "lm3630_bl: Backlight external control v1.0"

This reverts commit 6c22f8c9a959bd59c4f46ac39a536de8d1fffda8.

Asynchronous Fsync: initial extraction of Async Fsync from HTC

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	drivers/mmc/core/mmc.c
	fs/Kconfig

Conflicts:
	fs/Kconfig

fs/Kconfig: fix warning related to AYSNC_FSYNC patch

Signed-off-by: Paul Reioux <reioux@gmail.com>

defconfig: CONFIG_ASYNC_FSYNC=y

fixed a little cherry-pick typo