[fidl][go] Rename test.fidl to avoid API review

Change-Id: I4b5d6bf08b37da9f320489245f88d12f50e020b2
diff --git a/src/syscall/zx/fidl/bindingstest/test.fidl b/src/syscall/zx/fidl/bindingstest/test.test.fidl
similarity index 100%
rename from src/syscall/zx/fidl/bindingstest/test.fidl
rename to src/syscall/zx/fidl/bindingstest/test.test.fidl