msm7x30: Disable Atlas service

Disable Atlas service to avoid memory overhaed caused by it.

Drawbacks in Atlas service:
- Fixed size of canvas: whether the drawebles are in use or not always
                        resides in memory.
- Choosing drawables: It chooses the drawables to pre-load based on
                      dimensions, rather than number of requested apps.

Change-Id: I0b9d1c3529054df2fa9b7f5c701c2a35499f2234