[gigablue - seplus,ueplus, quad, quadplus] - Update initrd.bin
initrd.bin - shortinfo:
* requires new bootloader (CFE) - will be released shortly
* CFE checks if initrd.bin is available in gigablue/{machine}/initrd.bin
   * If yes, CFE loads initrd.bin and flashes image using USB 2.0 instead of 1.1
   * If no, CFE flashes image normally using USB 1.1
* Old bootloaders do not check existence of initrd.bin - so it does not harm if shipped in image, just no effect then