avicii: Enable DSDS by default

* Nord does not have a single sim variant

Bug: 197273281
Test: Confirm DSDS property.
Change-Id: I007ef6b81ddfdb3d9692f286bbcb85c2bae5dae5

system_ext.prop

@@ -40,6 +40,7 @@ persist.vendor.data.mode=concurrent
 
 # Radio
 ril.subscription.types=NV,RUIM
+persist.radio.multisim.config=dsds
 
 # Sensors
 persist.vendor.sensors.enable.mag_filter=true