tools/blobtool: Remove -c/--chunk option
tools/blobtool: Remove -c/--chunk option

- Remove code for chunk-style crypto, since this is now handled by
disktool

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr