Make locksettings commands go through "cmd lock_settings"

This greatly improves the performance of locksettings commands, and it
eliminates the need for LockSettingsCmd.java.

Bug: 177985929
Test: locksettings command still works
Change-Id: I5881fa074681f6bf1ad2f5969a282d928121ddb2
diff --git a/cmds/locksettings/Android.bp b/cmds/locksettings/Android.bp
index 5ee5824..ee31aed 100644
--- a/cmds/locksettings/Android.bp
+++ b/cmds/locksettings/Android.bp
@@ -21,8 +21,7 @@
     default_applicable_licenses: ["frameworks_base_license"],
 }
 
-java_binary {
+sh_binary {
     name: "locksettings",
-    wrapper: "locksettings.sh",
-    srcs: ["**/*.java"],
+    src: "locksettings.sh",
 }