* Add calculated redundancy values when writing eFuse blocks 1-3
 * Perform 192 -> 256 bit key extension when encrypting images for flashing

Fixes https://github.com/cesanta/mos-tool/issues/37

CL: mos: ESP32: Add support for the 3/4 key encoding scheme

PUBLISHED_FROM=16639fb25d5200550ad2097929239d896e188b5b