initramfs_st: remove m-sim for nightlies before march 2014

equal to cm-11-M4 release for other devices
http://www.cyanogenmod.org/blog/cm-11-m4-post-release-items
Revert "initramfs_st: remove m-sim for nightlies before march 2014"

This reverts commit fd5406e024e34c3211f36ae98686d2be55922edc.