graphics: remvoe -Wno-unused-parameter

Bug: 34611192
Test: builds
Change-Id: I8d6802ee6c618ea506fcca8e7d74e3b7026f29be
diff --git a/graphics/allocator/2.0/default/Android.bp b/graphics/allocator/2.0/default/Android.bp
index 4a7cfe0..9968f41 100644
--- a/graphics/allocator/2.0/default/Android.bp
+++ b/graphics/allocator/2.0/default/Android.bp
@@ -42,7 +42,7 @@
     defaults: ["hidl_defaults"],
     srcs: ["gralloc1-adapter.cpp", "Gralloc1On0Adapter.cpp"],
     include_dirs: ["system/core/libsync/include"],
-    cflags: ["-Wall", "-Wextra", "-Wno-unused-parameter"],
+    cflags: ["-Wall", "-Wextra"],
     export_include_dirs: ["."],
     whole_static_libs: ["libgrallocusage"],
 }