configs: add STK for gsm and cdma devices (specifically tablets)

Change-Id: Ic35fcfaf1e2326758edc1dff5b08e76fb8a1d250
diff --git a/config/cdma.mk b/config/cdma.mk
index e69de29..85019c6 100644
--- a/config/cdma.mk
+++ b/config/cdma.mk
@@ -0,0 +1,3 @@
+# SIM Toolkit
+PRODUCT_PACKAGES += \
+    Stk
\ No newline at end of file