Revert "Remove conditional vndbinder usage in CAS."

This reverts commit 5884a6f0f3.
Bug: 70393284

Reason for revert: Fugu doesn't have vndbinder yet.
Exempt-from-owner-approval: Device doesn't boot.

Change-Id: Ib23691c102fd8aca63a4a6755eb7fd1f9e852a4d

cas/1.0/default/Android.bp

@@ -12,6 +12,12 @@ cc_binary {
       "TypeConvert.cpp",
     ],
 
+    product_variables: {
+        treble: {
+            cflags: ["-DUSE_VNDBINDER"],
+        },
+    },
+
     compile_multilib: "32",
     init_rc: ["android.hardware.cas@1.0-service.rc"],
 

cas/1.0/default/service.cpp

@@ -31,9 +31,11 @@ using android::hardware::cas::V1_0::IMediaCasService;
 int main() {
     ALOGD("android.hardware.cas@1.0-service starting...");
 
+#ifdef USE_VNDBINDER
     // The CAS HAL may communicate to other vendor components via
     // /dev/vndbinder
     android::ProcessState::initWithDriver("/dev/vndbinder");
+#endif // USE_VNDBINDER
 
     configureRpcThreadpool(8, true /* callerWillJoin */);