Use -Werror in hardware/intel/common/omx-components/videocodec

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: I3ab89ee04870c41a40c12cc9f02507515caf0d0f
diff --git a/videocodec/Android.mk b/videocodec/Android.mk
index 438a238..89779cc 100755
--- a/videocodec/Android.mk
+++ b/videocodec/Android.mk
@@ -511,7 +511,7 @@
 endif
 
 # TODO: Fix this.
-LOCAL_CFLAGS += -Wno-error=unused-variable
+LOCAL_CFLAGS += -Wall -Werror -Wno-error=unused-variable
 
 include $(BUILD_SHARED_LIBRARY)
 endif