Make system property audio.camerasound.force a vendor-writable property,

This property is read by the audio service in system server to toggle
camera shutter sound enforcement on a device-specific basis.

Test: Camera shutter sound enforcement works when audio.camerasound.force is set
Bug: 110126976
Change-Id: I2720d3c699c4712d1a328f59dde0b16bbf1016f3

private/compat/26.0/26.0.ignore.cil

@@ -25,6 +25,7 @@
     e2fs
     e2fs_exec
     exfat
+    exported_audio_prop
     exported_bluetooth_prop
     exported_config_prop
     exported_dalvik_prop

private/compat/27.0/27.0.ignore.cil

@@ -29,6 +29,7 @@
     exported3_default_prop
     exported3_radio_prop
     exported3_system_prop
+    exported_audio_prop
     exported_bluetooth_prop
     exported_config_prop
     exported_dalvik_prop

private/system_server.te

@@ -536,6 +536,10 @@ get_prop(system_server, serialno_prop)
 # Read/write the property which keeps track of whether this is the first start of system_server
 set_prop(system_server, firstboot_prop)
 
+# Audio service in system server can read exported audio properties,
+# such as camera shutter enforcement
+get_prop(system_server, exported_audio_prop)
+
 # Create a socket for connections from debuggerd.
 allow system_server system_ndebug_socket:sock_file create_file_perms;
 

public/property.te

@@ -67,6 +67,7 @@ type wifi_prop, property_type;
 type vendor_security_patch_level_prop, property_type;
 
 # Properties for whitelisting
+type exported_audio_prop, property_type;
 type exported_bluetooth_prop, property_type;
 type exported_config_prop, property_type;
 type exported_dalvik_prop, property_type;

public/property_contexts

@@ -3,6 +3,7 @@ persist.radio.airplane_mode_on u:object_r:exported2_radio_prop:s0 exact int
 
 # vendor-init-settable
 af.fast_track_multiplier u:object_r:exported3_default_prop:s0 exact int
+audio.camerasound.force u:object_r:exported_audio_prop:s0 exact bool
 camera.disable_zsl_mode u:object_r:exported3_default_prop:s0 exact bool
 camera.fifo.disable u:object_r:exported3_default_prop:s0 exact int
 dalvik.vm.appimageformat u:object_r:exported_dalvik_prop:s0 exact string

public/vendor_init.te

@@ -176,6 +176,7 @@ not_compatible_property(`
 
 set_prop(vendor_init, bluetooth_a2dp_offload_prop)
 set_prop(vendor_init, debug_prop)
+set_prop(vendor_init, exported_audio_prop)
 set_prop(vendor_init, exported_bluetooth_prop)
 set_prop(vendor_init, exported_config_prop)
 set_prop(vendor_init, exported_dalvik_prop)