Allow vendor-init-settable to persist.radio.multisim.config

A default value of persist.radio.multisim.config can be set by SoC
vendors, and so vendor-init-settable should be allowed to it.

Bug: 73871799
Test: succeeded building and tested with taimen
Change-Id: Ie62b91e7e3d7e05425b742838417f1cab7b3fed4
diff --git a/public/hal_telephony.te b/public/hal_telephony.te
index 86f41cb..31859aa 100644
--- a/public/hal_telephony.te
+++ b/public/hal_telephony.te
@@ -27,6 +27,7 @@
 set_prop(hal_telephony_server, radio_prop)
 set_prop(hal_telephony_server, exported_radio_prop)
 set_prop(hal_telephony_server, exported2_radio_prop)
+set_prop(hal_telephony_server, exported3_radio_prop)
 
 allow hal_telephony_server tty_device:chr_file rw_file_perms;