Reverts half of commit 224743c6b7
Reverts parts of commit 4908ef3e42
Lockdown VPN still needs this to start properly on devices without FBE,
such as phones upgraded from M. Without listening to USER_PRESENT the
first unlock of keystore may get missed, since USER_UNLOCKED is sent too
soon to be useful.
Bug: 34587043
Change-Id: If7a2f5a3173b0f6856244a5f7904bf00c9a5b5e7