n7100 initramfs fix

Change-Id: I85abfbd1dc976d59d05cddc976d88ed8dbecc8a9
note2 init: only replace samsung selinux files with cm ones, if f2fs is used

Change-Id: I7093fb159a60eeba4c22978efa71c3a3853712bd
build script: improve fixing initramfs permissions

Change-Id: I21654c8951c0f7ea831e5b2803cb720eba089bd1