virtmanager: add selinux domain

Address any denials in the log - currently just adding
the virtualization service.

Bug: 183583115
Test: ps -AZ | grep virtmanager
u: r:virtmanager:s0             virtmanager   2453     1 10930880  4544 0                   0 S virtmanager
Change-Id: Ie034dcc3b1dbee610c591220358065b8508d81cf
diff --git a/private/service_contexts b/private/service_contexts
index 826bc3a..303ecff 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -70,6 +70,7 @@
 carrier_config                            u:object_r:radio_service:s0
 clipboard                                 u:object_r:clipboard_service:s0
 com.android.net.IProxyService             u:object_r:IProxyService_service:s0
+android.system.virtmanager                u:object_r:virtualization_service:s0
 companiondevice                           u:object_r:companion_device_service:s0
 platform_compat                           u:object_r:platform_compat_service:s0
 platform_compat_native                    u:object_r:platform_compat_service:s0