init.cm: Fix sysinit dependencies

sysinit depends on having the filesystems mounted, and userdata
in particular depends on having /data present. Move its startup
to post-fs-data

Change-Id: Iafcc926a3aa310c1afe501d272df5811da500d86
cm: Remove legacy compcache stuff

 * Remove all this stuff.  If a device wants ZRAM, it should be
   enabled by the maintainer and properly configured and tuned.
 * This stuff currently causes a conflict with the ZRAM support
   added in Kitkat. Kill it.

Change-Id: Ib2488ea4463e32ec44b65fe786f732145b5b6e23