Add makefile to define PRODUCT_SHIPPING_API_LEVEL for O release

For Android O release PRODUCT_SHIPPING_API_LEVEL is set to 26.

Change-Id: Ie1d5af375f2db95850fc5395d6a0c775dbfa046d
Merged-In: Ie1d5af375f2db95850fc5395d6a0c775dbfa046d
(cherry picked from commit f3251ac73b0320bf9ae6c2e1d623dba9026e1d7c)
diff --git a/target/product/product_launched_with_o.mk b/target/product/product_launched_with_o.mk
new file mode 100644
index 0000000..94d30c6
--- /dev/null
+++ b/target/product/product_launched_with_o.mk
@@ -0,0 +1,2 @@
+#PRODUCT_SHIPPING_API_LEVEL indicates the first api level, device has been commercially launced on.
+PRODUCT_SHIPPING_API_LEVEL := 26