Add SuperSU [1/2]

Change-Id: Ib8646a04442abc8b509a004c3d3bb1616f0b588e

Conflicts:
	config/common.mk
Update superSU v2.37

Change-Id: Ic425292449b7274b8b9f8a0bd33944b21ca09762
Update SuperSU v2.40

Change-Id: Icc1136e376269cd650ffb15979dfb0572c852b18
[1/2] Add busybox

Signed-off-by: Chintan Shah <cgintan1998@gmail.com>