Allow system_server to communicate with virtual_camera

and consitently name service and process as "virtual_camera" (with
underscore)

Test: Cts VirtalCameraTest
Bug: 270352264
Change-Id: I2c6c0c03aab47aa1795cbda19af25e6661a0bf4a
diff --git a/private/service_contexts b/private/service_contexts
index 898cb14..a803d51 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -438,6 +438,7 @@
 vibrator                                  u:object_r:vibrator_service:s0
 vibrator_control               	  	  u:object_r:vibrator_control_service:s0
 vibrator_manager                          u:object_r:vibrator_manager_service:s0
+virtual_camera                            u:object_r:virtual_camera_service:s0
 virtualdevice                             u:object_r:virtual_device_service:s0
 virtualdevice_native                      u:object_r:virtual_device_native_service:s0
 virtual_touchpad                          u:object_r:virtual_touchpad_service:s0