ghost: Don't set custom vmalloc, remove unused zcache flag

* Unsure why Motorola set 400MB, but it appears not to be necessary.
* Use Linux standard 128MB
* zcache isn't generally available on ARM kernels.

Change-Id: Ia3a415a888cceaef71b6bcf2cd4988ec32415b30
Merge remote-tracking branch 'cm/cm-11.0' into kitkat