zenfone8: Include qti display-product-system.mk

to fix the dlopen failed and prevent black screen on AOD

E AndroidRuntime: java.lang.UnsatisfiedLinkError: dlopen failed: library "vendor.display.config@1.0.so" not found: needed by /system_ext/lib64/libsecureuisvc_jni.so in namespace classloader-namespace-shared

Change-Id: Id0ae1658031011a9a44b867cca00ecf942ff79d6
diff --git a/device.mk b/device.mk
index 62ce22b..8866671 100755
--- a/device.mk
+++ b/device.mk
@@ -152,6 +152,7 @@
 $(call inherit-product, vendor/qcom/opensource/display/config/display-product-vendor.mk)
 $(call inherit-product, vendor/qcom/opensource/commonsys/display/config/display-product-commonsys.mk)
 $(call inherit-product, vendor/qcom/opensource/commonsys-intf/display/config/display-interfaces-product.mk)
+$(call inherit-product, vendor/qcom/opensource/commonsys-intf/display/config/display-product-system.mk)
 
 PRODUCT_PACKAGES += \
     libtinyalsa