Update PRODUCT_SHIPPING_API_LEVEL for gs101 devices

Test: adb shell getprop ro.product.first_api_level
Bug: 202921268
Change-Id: I3de89e705c1e7f0bac5f6d4b4b2791ef2edcfec6
Signed-off-by: Alex Hong <rurumihong@google.com>
diff --git a/device-oriole.mk b/device-oriole.mk
index 8d66e4a..ee924d4 100644
--- a/device-oriole.mk
+++ b/device-oriole.mk
@@ -218,3 +218,6 @@
 # Set zram size
 PRODUCT_VENDOR_PROPERTIES += \
     vendor.zram.size=3g
+
+# This device is shipped with 31 (Android S)
+PRODUCT_SHIPPING_API_LEVEL := 31