am 1762dbfb: am 2d2fd4cd: Merge changes Ibff1f74e,Ic82595cf,If4e01cab

* commit '1762dbfbab7caab7f7e57aaaa5e1491e96e55d42':
  fastboot: Added tos as an optional image
  fastboot: Fixed optional entries
  fastboot: allow format on devices with small buffers