Remove unused system_modules

With
https://android-review.googlesource.com/c/platform/build/soong/+/1145829,
android_*stubs_current_system_modules are no longer used. Thus removing.

Bug: 142896162
Test: m checkbuild
Change-Id: I203766d92a8ebac862a816e9b6b68b6d47d5312c
diff --git a/StubLibraries.bp b/StubLibraries.bp
index 78f1b9c..d195047 100644
--- a/StubLibraries.bp
+++ b/StubLibraries.bp
@@ -217,21 +217,6 @@
     defaults: ["framework-stubs-default"],
 }
 
-java_system_modules {
-    name: "android_stubs_current_system_modules",
-    libs: ["android_stubs_current"],
-}
-
-java_system_modules {
-    name: "android_system_stubs_current_system_modules",
-    libs: ["android_system_stubs_current"],
-}
-
-java_system_modules {
-    name: "android_test_stubs_current_system_modules",
-    libs: ["android_test_stubs_current"],
-}
-
 /////////////////////////////////////////////////////////////////////
 // hwbinder.stubs provides APIs required for building HIDL Java
 // libraries.