nanohub: firmware: fix secret key lookup am: af5d063285
am: d37f2f149f

* commit 'd37f2f149f728f6a6f8d3e2927ce6dbe7e751b64':
  nanohub: firmware: fix secret key lookup

Change-Id: I2350519f6dd5ed76e4557328aff0fa55d60b4fc6