root.bp: Use system/*

Test: Soong's build.ninja identical before/after (except GlobRules)
Change-Id: I2fcdcd77083cbb49dc6b20a169964558510d91dc
diff --git a/root.bp b/root.bp
index 7e4636f..8b3b71f 100644
--- a/root.bp
+++ b/root.bp
@@ -28,14 +28,7 @@
     "packages/apps/HTMLViewer",
     "prebuilts/ndk",
     "prebuilts/sdk",
-    "system/core/*",
-    "system/extras/*",
-    "system/keymaster",
-    "system/hwservicemanager",
-    "system/libhidl",
-    "system/libhwbinder",
-    "system/media/*",
-    "system/security/*",
+    "system/*",
     "system/tools/*",
     "test/vts",
 ]