Ensure the base system includes toybox.

Change-Id: I0eec19328855d67da1c574a88b452f0eeec6adc7
diff --git a/target/product/embedded.mk b/target/product/embedded.mk
index 9929616..fb6ea42 100644
--- a/target/product/embedded.mk
+++ b/target/product/embedded.mk
@@ -48,6 +48,7 @@
     libm \
     libpixelflinger \
     libpower \
+    libsigchain \
     libstdc++ \
     libsurfaceflinger \
     libsurfaceflinger_ddmconnection \
@@ -65,7 +66,7 @@
     sh \
     surfaceflinger \
     toolbox \
-    libsigchain
+    toybox \
 
 # SELinux packages
 PRODUCT_PACKAGES += \