FP4: Remove persist.sys.fflag.override.settings_bluetooth_hearing_aid

This has been replaced by `bluetooth.profile.asha.central.enabled`

Change-Id: I0bb72ec01a77f790ebeb594e45c695e9a087dc43
diff --git a/vendor.prop b/vendor.prop
index 196adf7..1bbd0e1 100644
--- a/vendor.prop
+++ b/vendor.prop
@@ -46,7 +46,6 @@
 # Bluetooth
 persist.bluetooth.a2dp_offload.cap=sbc-aac-aptx-aptxhd-ldac
 persist.bluetooth.a2dp_offload.disabled=true
-persist.sys.fflag.override.settings_bluetooth_hearing_aid=true
 persist.vendor.bt.a2dp_offload_cap=sbc-aac-aptx-aptxhd-ldac
 persist.vendor.bt.aac_frm_ctl.enabled=true
 persist.vendor.bt.aac_vbr_frm_ctl.enabled=true