Re-enable standalone power collapse on d2 and apex devices

Relevant CAF patch: http://bit.ly/1cyXgQk

Change-Id: I20ece0b0ffc356e5d8a9112dba505a65f7f85fc3
M2: msm: grow MM heap size for the iommu use case
From 96 to 128 MB.

Heap size appears to be too small still for some instances while recording 1080p from back camera.
Instagram video for example causes memory issues and locks camera device till reboot.
Increasing the memory size resolves this.

Change-Id: I83bbb7da7a5776afaf6e77886755a76a78969319