Update prebuilt_etc package name.

Test: m nothing + TreeHugger
Bug: 156980228
Change-Id: I9ea5bf3b53c0bc3172f2be11439c91a33fdecf64
diff --git a/soong/Android.bp b/soong/Android.bp
index 252d314..8e9789b 100644
--- a/soong/Android.bp
+++ b/soong/Android.bp
@@ -3,6 +3,7 @@
     pkgPath: "android/soong/system/ca-certificates",
     deps: [
         "soong-android",
+        "soong-etc",
         "soong-phony",
     ],
     srcs: [