Add appwidget to system image.

Change-Id: I0d5db3f39390065ec5067bb9a15924fdcb181692
diff --git a/target/product/base.mk b/target/product/base.mk
index 981f965..fab45ef 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -18,6 +18,7 @@
 PRODUCT_PACKAGES += \
     20-dns.conf \
     95-configured \
+    appwidget \
     am \
     android.policy \
     android.test.runner \