LockSettingsService: pass SyntheticPassword to unlockKeystore()

Make unlockKeystore() consistent with unlockUserKey() by taking in the
SyntheticPassword instead of the Keystore password directly.  This is a
straightforward refactor.

Bug: 296464083
Test: atest com.android.server.locksettings
Change-Id: I4fe794615240e8a9a9d077dfbe3d693de4ec7f36
1 file changed