Add android.system.keystore2-unstable-ndk_platform to vndk.go

Test: N/A
Bug: 160623310
Change-Id: Ic2e9897a1c103389b93a72df25c38fe96a8c7c09
diff --git a/cc/config/vndk.go b/cc/config/vndk.go
index 6f2e807..d18ae25 100644
--- a/cc/config/vndk.go
+++ b/cc/config/vndk.go
@@ -25,6 +25,7 @@
 	"android.hardware.power-ndk_platform",
 	"android.hardware.rebootescrow-ndk_platform",
 	"android.hardware.vibrator-ndk_platform",
+	"android.system.keystore2-unstable-ndk_platform",
 	"libbinder",
 	"libcrypto",
 	"libexpat",