Rename exported3_radio_prop to radio_control_prop

The context name exported3_radio_prop is ambiguous and does not reflect
the usage and role of the properties. This changes its name to
radio_control_prop.

Some downstream branches are still using exported3_radio_prop, so
get_prop(domain, radio_control_prop) is added to avoid regression. It's
just a workaround and to be removed soon, after all exported3_radio_prop
are cleaned up.

Bug: 162214733
Test: boot a device with a sim and see basic functions work
Change-Id: If5fe3be7c64b36435c4ad0dc9a8089077295d502
Merged-In: If5fe3be7c64b36435c4ad0dc9a8089077295d502
diff --git a/private/property_contexts b/private/property_contexts
index 31ef801..9cf28a1 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -362,7 +362,7 @@
 persist.bluetooth.bluetooth_audio_hal.disabled u:object_r:bluetooth_audio_hal_prop:s0 exact bool
 persist.bluetooth.btsnoopenable                u:object_r:exported_bluetooth_prop:s0 exact bool
 
-persist.radio.multisim.config u:object_r:exported3_radio_prop:s0 exact string
+persist.radio.multisim.config u:object_r:radio_control_prop:s0 exact string
 
 persist.sys.hdmi.keep_awake              u:object_r:hdmi_config_prop:s0 exact bool
 ro.hdmi.cec_device_types                 u:object_r:hdmi_config_prop:s0 exact string