remove AOSP su implementation

for our su

Change-Id: Ie1361cccacd172b0a22f559c646859ffe523a809
system_extras: Add make_ext4fs utility

Add make_ext4fs into $OUT/Utilities needed for some devices like Galaxy S I9000

Change-Id: Id9c9ce79282859542a1e44501b19594145d80275
ext4_utils: Yet another MMC discard pain in the ass

 * Secure discard on some devices are painfully slow.

Change-Id: Id6cc80ea7a25410b812803425a4b6267289834fb
Merge remote-tracking branch 'aosp/kitkat-mr1-release' into HEAD
Add fowards/backwords compatability defines

Also remove duplicate define.
PS2: Re-Add define

Change-Id: Ie1950953d26d218775eb6c0d2fbd8ed525bb7949
Clean up wipe.c

Move around logic of wipe.c to better handle secure discard

Change-Id: I8ad3d2765713f4225536728654f88697a76aab1b