onclite: Move IMS ringback workaround prop to system_ext

Change-Id: I294f088612d622d98ada0380bef60a44d6cdac43

system_ext.prop

 # DPM
 persist.vendor.dpm.feature=11
+
+# Telephony
+# Disable handling audio direction changes on IMS calls.
+ro.telephony.handle_audio_direction_changes_between_call_state_changes=false
+

vendor.prop

@@ -74,7 +74,3 @@ persist.vendor.radio.sib16_support=1
 persist.vendor.radio.start_ota_daemon=1
 persist.vendor.radio.sw_mbn_update=0
 vendor.rild.libpath=/vendor/lib64/libril-qc-qmi-1.so
-
-# Telephony
-# Disable handling audio direction changes on IMS calls.
-ro.telephony.handle_audio_direction_changes_between_call_state_changes=false