Replace soong variables with cc_defaults.

Bug: 64318482
Test: links
Change-Id: Id03af485a4282db5b9a13a79fce00a2d66b59ffc
diff --git a/transport/Android.bp b/transport/Android.bp
index acd3d2c..62aee52 100644
--- a/transport/Android.bp
+++ b/transport/Android.bp
@@ -31,8 +31,10 @@
         enabled: true,
         support_system_process: true,
     },
-    defaults: ["hidl-module-defaults"],
-    cflags: libhidl_flags,
+    defaults: [
+        "libhidl-defaults",
+        "hidl-module-defaults",
+    ],
     shared_libs: [
         "libbase",
         "liblog",