msm8953-common: Update fstab flags for f2fs

* Use fsync_mode=nobarrier to improve random write and fsync performance
* Enable runtime discard to take advantage of asynchronous TRIM
* Remove formattable flag to be sure we always have ext4 by default

Change-Id: Ic7f6fbad178ef6251924e4414c660f4dbe1a8c44

rootdir/fstab.qcom

@@ -8,7 +8,7 @@
 
 /dev/block/bootdevice/by-name/system		/system			ext4	ro								wait,recoveryonly
 /dev/block/bootdevice/by-name/cust		/vendor			ext4	ro								wait,recoveryonly
-/dev/block/bootdevice/by-name/userdata		/data			f2fs	nosuid,nodev,noatime,data_flush					wait,check,encryptable=footer,quota,formattable
+/dev/block/bootdevice/by-name/userdata		/data			f2fs	nosuid,nodev,noatime,discard,fsync_mode=nobarrier		wait,check,encryptable=footer,quota
 /dev/block/bootdevice/by-name/userdata		/data			ext4	nosuid,nodev,noatime,noauto_da_alloc				wait,check,encryptable=footer,quota,formattable
 /dev/block/bootdevice/by-name/cache		/cache			f2fs	nosuid,nodev,noatime,inline_xattr,flush_merge,data_flush	wait,formattable,check
 /dev/block/bootdevice/by-name/cache		/cache			ext4	nosuid,nodev,noatime						wait,formattable,check

rootdir/fstab_AB.qcom

@@ -4,7 +4,7 @@
 
 #<src>						<mnt_point>		<type>	<mnt_flags and options>						<fs_mgr_flags>
 /dev/block/bootdevice/by-name/system		/			ext4	ro,barrier=1,discard						wait,slotselect
-/dev/block/bootdevice/by-name/userdata		/data			f2fs	nosuid,nodev,noatime,data_flush					wait,check,encryptable=footer,quota,formattable
+/dev/block/bootdevice/by-name/userdata		/data			f2fs	nosuid,nodev,noatime,discard,fsync_mode=nobarrier		wait,check,encryptable=footer,quota
 /dev/block/bootdevice/by-name/userdata		/data			ext4	nosuid,nodev,noatime,noauto_da_alloc				wait,check,encryptable=footer,quota,formattable
 /dev/block/bootdevice/by-name/persist		/mnt/vendor/persist		ext4	nosuid,nodev,noatime						wait,check
 /dev/block/bootdevice/by-name/dsp		/vendor/dsp			ext4	ro,nosuid,nodev							wait