dragon add first_api_level property

Test: run cts -m CtsSecurityHostTestCases
Bug: 38432099
Change-Id: I03229bef144d3e97ae35ab586bb95acf1974a8bf
diff --git a/device.mk b/device.mk
index 16d6242..3d8f38e 100644
--- a/device.mk
+++ b/device.mk
@@ -252,6 +252,10 @@
 PRODUCT_PROPERTY_OVERRIDES += \
     persist.media.treble_omx=false
 
+# ro.product.first_api_level indicates the first api level the device has commercially launched on.
+PRODUCT_PROPERTY_OVERRIDES += \
+    ro.product.first_api_level=23
+
 # for keyboard key mappings
 PRODUCT_PACKAGES += \
     DragonKeyboard