am 5620d94c: am 449b8a06: am c4904316: am ffe86de5: Merge "vboot_signer: Add kernel subkey required for signing kernel keyblock" into mnc-dr-dev

* commit '5620d94c5fd5a249f1805ca7acd5fe22930ddef4':
  vboot_signer: Add kernel subkey required for signing kernel keyblock