Label keys with all the possible FBE prefixes that might apply

We don't know which FS and kernel version is going to want these keys,
so put them in the kernel three times with all three possible prefixes.

Test: Marlin set up before this change successfully boots after it.
Change-Id: I6ccfe0894551ba068de9bf5e23fe4fd1e10e36b1
2 files changed