Write out entropy if we're shutting down or rebooting,
or if someone plugs in the power.
Bug: 8312061
Change-Id: Id9a48064a7bdfe6c05a9227ea95a1bdbd0e9b8ae
This does some cleanup of the initial boot, especially when
booting in "no core apps" mode for encryption/decryption.
Change-Id: Ifb3949f580e52f54559e603c4b0b104f6bac2f6c
EntropyService implies that this program provides entropy to other
programs, and is misleading. The EntropyMixer class is designed purely
to stir the existing entropy pool with some possibily random-ish data,
and carryover entropy across device reboots.
Change-Id: I086cd339a3b652d32371521e61e1b1f555ce2280
