scripts: fuzz: fix SOF config pass

This script unfortunately never consumed the right config since the
overlay was being passed to zephyr, not SOF.

Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>

Author: cujomalainey

scripts/fuzz.sh

@@ -80,12 +80,14 @@ main()
     -DCONFIG_ASAN=y
   )
 
+  configs="${fuzz_configs[@]}"
+
   if [ ! -z $OVERLAY ]; then
-      overlay_config=$(xargs -a "$SOF_TOP/app/$OVERLAY" printf -- "-D%s ")
+      configs+="-DEXTRA_CONF_FILE=$OVERLAY"
   fi
 
   west build -d build-fuzz -b native_posix "$SOF_TOP"/app/ -- \
-      "${fuzz_configs[@]}" "$overlay_config" "$@"
+       $configs "$@"
 
   if [ $BUILD_ONLY -eq 1 ]; then
       exit