envsetup.sh: add missing dquotes

Change-Id: Ic86a5dd36b0f32cd7dc4d2f9c187566398796ed6
build: get rid of the sparse expand stuff

* i don't see a reason why we are doing this because we never deal
with flashing system img rawly
* This will put useless write on ssd..
* we don't have space on ssd

Change-Id: Icd53d161b8515f5eca238b98ad68515d69caa34f