Remove unused template

Previously, code does not compile if using Post(fence) method. Error
message is no matching member function for call to 'Post',
frameworks/native/libs/vr/libbufferhub/include/private/dvr/buffer_hub_client.h:217:7:
note: candidate template ignored: couldn't infer template argument
'Meta'.

Test: use Post method in test and build on oc-dr1-daydream-dev branch.
Bug: None
Change-Id: Icc6977ec6b805d062cb3d0289c73fbf8b43ec940
diff --git a/libs/vr/libbufferhub/buffer_hub-test.cpp b/libs/vr/libbufferhub/buffer_hub-test.cpp
index 2ab5b65..37b9a03 100644
--- a/libs/vr/libbufferhub/buffer_hub-test.cpp
+++ b/libs/vr/libbufferhub/buffer_hub-test.cpp
@@ -593,7 +593,7 @@
 
   LocalHandle fence;
 
-  EXPECT_EQ(0, p->Post<void>(LocalHandle()));
+  EXPECT_EQ(0, p->Post(LocalHandle()));
   EXPECT_EQ(0, c->Acquire(&fence));
 }
 
diff --git a/libs/vr/libbufferhub/include/private/dvr/buffer_hub_client.h b/libs/vr/libbufferhub/include/private/dvr/buffer_hub_client.h
index b71f5dc..0b2666a 100644
--- a/libs/vr/libbufferhub/include/private/dvr/buffer_hub_client.h
+++ b/libs/vr/libbufferhub/include/private/dvr/buffer_hub_client.h
@@ -212,11 +212,10 @@
   int Post(const LocalHandle& ready_fence, const void* meta,
            size_t user_metadata_size);
 
-  template <typename Meta,
-            typename = typename std::enable_if<std::is_void<Meta>::value>::type>
   int Post(const LocalHandle& ready_fence) {
     return Post(ready_fence, nullptr, 0);
   }
+
   template <typename Meta, typename = typename std::enable_if<
                                !std::is_void<Meta>::value>::type>
   int Post(const LocalHandle& ready_fence, const Meta& meta) {