Use dep-suffixes rather than dependency_suffix.

This is easier to convert to cargo_embargo format.

Test: Ran cargo2android.py, no change to Android.bp
Change-Id: I63fc0bc5471c564ef93f888064a5caf4a52777ce
diff --git a/cargo2android.json b/cargo2android.json
index e6baa85..aa2b569 100644
--- a/cargo2android.json
+++ b/cargo2android.json
@@ -13,7 +13,10 @@
       "device": true,
       "no-host": true,
       "add-module-block": "cargo2android_viz.bp",
-      "dependency_suffix": "_nostd",
+      "dep-suffixes": {
+        "der": "_nostd",
+        "spki": "_nostd"
+      },
       "force-rlib": true,
       "suffix": "_nostd",
       "no-std": true