Add SIM toolkit for GSM builds.
diff --git a/products/gsm.mk b/products/gsm.mk
index 8f21b28..d5e77b1 100644
--- a/products/gsm.mk
+++ b/products/gsm.mk
@@ -2,3 +2,6 @@
 PRODUCT_COPY_FILES += \
     vendor/cyanogen/prebuilt/common/etc/apns-conf.xml:system/etc/apns-conf.xml
 
+# SIM Toolkit
+PRODUCT_PACKAGES += \
+    Stk