gts: ro.product.first_api_level needs to be set to L (23)

Test: manual confirmation
Bug: 33677064
Change-Id: I9e5b676ccbe4ba5322ad313ac336eebb2010f2db
diff --git a/device.mk b/device.mk
index 4613af7..6a40714 100644
--- a/device.mk
+++ b/device.mk
@@ -220,6 +220,7 @@
     ro.hwui.disable_scissor_opt=true \
     ro.bt.bdaddr_path=/sys/module/flounder_bdaddress/parameters/bdaddress \
     ro.frp.pst=/dev/block/platform/sdhci-tegra.3/by-name/PST \
+    ro.product.first_api_level=23 \
     ro.ril.def.agps.mode=1 \
     persist.tegra.compositor=glcomposer