LockSettingsService: pass SyntheticPassword to setUserKeyProtection()

Make setUserKeyProtection() consistent with unlockUserKey() by taking in
the SyntheticPassword instead of the "FBE key" directly.  This is a
straightforward refactor.

Bug: 296464083
Test: atest com.android.server.locksettings
Change-Id: I3a1a51c4f94b1e5082d9be65306df29aad2e3036
1 file changed