Set data roaming deactivated as default

Issue: FP3-A11#183
Change-Id: Id9deb65227d35fce55d4cf072d8aa4ae09973b1b
(cherry picked from commit e92ad0f41fe4ab632187e672ac21f03cd293ad74)
diff --git a/device.mk b/device.mk
index 6466d15..2b015d1 100644
--- a/device.mk
+++ b/device.mk
@@ -15,6 +15,10 @@
 
 FP_PATH := device/fairphone/FP3
 
+# Disable data roaming by default
+PRODUCT_PROPERTY_OVERRIDES += \
+	ro.com.android.dataroaming=false
+
 # Call the vendor setup
 $(call inherit-product-if-exists, vendor/fairphone/fp3-common/device-vendor.mk)