Add -Wno-unused-parameter

GCC 4.8 emits more warnings.

BUG: 10726440

(cherry picked from commit ff68988ec79b42c6673008b968f0ae89036c38ef)

Change-Id: I68c7aad6c07c2c440122e54791ea82eb07a2163b
diff --git a/camera/QCamera2/stack/mm-jpeg-interface/test/Android.mk b/camera/QCamera2/stack/mm-jpeg-interface/test/Android.mk
index e8aad0e..f506c67 100644
--- a/camera/QCamera2/stack/mm-jpeg-interface/test/Android.mk
+++ b/camera/QCamera2/stack/mm-jpeg-interface/test/Android.mk
@@ -6,7 +6,7 @@
 LOCAL_MODULE_TAGS := optional
 
 LOCAL_CFLAGS := -DCAMERA_ION_HEAP_ID=ION_IOMMU_HEAP_ID
-LOCAL_CFLAGS += -Werror
+LOCAL_CFLAGS += -Werror -Wno-unused-parameter
 LOCAL_CFLAGS += -D_ANDROID_
 LOCAL_CFLAGS += -include mm_jpeg_dbg.h