serde: Enable the “rc” feature

This allows us to serialize and deserialize fields containing “Rc” and
“Arc” types. I need this for testing PDL, but it could potentially be
useful for others as well.

Note that enabling the feature simply allows Serde to generate code in
cases where it would fail with an error before.

Test: presubmit
Change-Id: Ie39d6b842c1718f0f2c4f824388a324df271804e
diff --git a/Android.bp b/Android.bp
index 71aa190..425e605 100644
--- a/Android.bp
+++ b/Android.bp
@@ -49,6 +49,7 @@
     features: [
         "default",
         "derive",
+        "rc",
         "serde_derive",
         "std",
     ],
@@ -76,6 +77,7 @@
     features: [
         "default",
         "derive",
+        "rc",
         "serde_derive",
         "std",
     ],
diff --git a/cargo2android.json b/cargo2android.json
index 2a35106..fa7bf50 100644
--- a/cargo2android.json
+++ b/cargo2android.json
@@ -8,8 +8,8 @@
   ],
   "dependencies": true,
   "device": true,
-  "features": "default,derive",
+  "features": "default,derive,rc",
   "run": true,
   "tests": true,
   "vendor-available": true
-}
\ No newline at end of file
+}