FP4: Drop deprecated IWLAN property

This is no longer read as of
https://github.com/LineageOS/android_frameworks_opt_telephony/commit/d8d3ed41243ba1fc4b5a5a2a6e30be3f6a404a9d

Change-Id: I1e56b56251d9e2d3cfbddd5ba575129885f9942a
diff --git a/vendor.prop b/vendor.prop
index db65c6a..debd9a8 100644
--- a/vendor.prop
+++ b/vendor.prop
@@ -161,7 +161,6 @@
 persist.vendor.radio.procedure_bytes=SKIP
 persist.vendor.radio.sib16_support=1
 ro.com.android.dataroaming=true
-ro.telephony.iwlan_operation_mode=AP-assisted
 
 # Sensors
 persist.vendor.sensors.debug.ssc_qmi_debug=true