Add vehicle_binding_util SELinux context

Adds required context for 'vehicle_binding_util' to 'vold' interactions.
The vehicle_binding_util actually fork/execvp vdc.
And vdc will call vold to set the binding seed value.

Test: manual 'make'
Bug: 157501579
Change-Id: I5194c9cd0f5a910b1309b547aabf66bb9c397738
diff --git a/private/file_contexts b/private/file_contexts
index d34f64f..2ac0981 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -370,6 +370,7 @@
 /system/bin/android\.frameworks\.automotive\.display@1\.0-service u:object_r:automotive_display_service_exec:s0
 /system/bin/snapuserd            u:object_r:snapuserd_exec:s0
 /system/bin/odsign               u:object_r:odsign_exec:s0
+/system/bin/vehicle_binding_util     u:object_r:vehicle_binding_util_exec:s0
 
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 # Vendor files