Remove unused `fence` field

NO_IFTTT=unused field not saved in snapshot

Bug: b/369615058
Test: build
Change-Id: I958a9d33a1635b59a8372b5914587f10c5ded375
diff --git a/host/VirtioGpuContext.h b/host/VirtioGpuContext.h
index 7636165..07c495f 100644
--- a/host/VirtioGpuContext.h
+++ b/host/VirtioGpuContext.h
@@ -40,7 +40,6 @@
     uint32_t capsetId;
     VirtioGpuContextId ctxId;
     GoldfishHostPipe* hostPipe;
-    int fence;
     std::unordered_map<VirtioGpuResourceId, uint32_t> addressSpaceHandles;
     std::unordered_map<uint32_t, struct stream_renderer_resource_create_args> blobMap;
     std::shared_ptr<gfxstream::SyncDescriptorInfo> latestFence;
diff --git a/host/VirtioGpuFrontend.cpp b/host/VirtioGpuFrontend.cpp
index 3c8e0c1..f240f03 100644
--- a/host/VirtioGpuFrontend.cpp
+++ b/host/VirtioGpuFrontend.cpp
@@ -174,7 +174,6 @@
         context_init,            // capsetId
         ctx_id,                  // ctxId
         hostPipe,                // hostPipe
-        0,                       // fence
         map,                     // resourceId --> ASG handle map
         blobMap,                 // blobId -> resource create args
     };