Migrate libmonet to external/ version

Test: atest SystemUITest
Bug: 290464773
Change-Id: Ia889671fe7f3f88f207f01c97ae423173098f936
diff --git a/packages/SystemUI/Android.bp b/packages/SystemUI/Android.bp
index 7be6043..eb7d836 100644
--- a/packages/SystemUI/Android.bp
+++ b/packages/SystemUI/Android.bp
@@ -193,6 +193,7 @@
         "SystemUI-tags",
         "SystemUI-proto",
         "monet",
+        "libmonet",
         "dagger2",
         "jsr305",
         "jsr330",
@@ -356,6 +357,7 @@
         "testables",
         "truth-prebuilt",
         "monet",
+        "libmonet",
         "dagger2",
         "jsr330",
         "WindowManager-Shell",