Add `android.system.vold` to sepolicy

Allow the `vold` service to expose the `android.system.vold.IVold`
interface to vendor.

Bug: 362567323
Test: acloud create
Change-Id: I074228c4a1033ddc63a547f15b093fe62a4ae86b
diff --git a/private/service_contexts b/private/service_contexts
index 2e050eb..e2998c7 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -141,6 +141,7 @@
 android.system.keystore2.IKeystoreService/default                    u:object_r:keystore_service:s0
 android.system.net.netd.INetd/default                                u:object_r:system_net_netd_service:s0
 android.system.suspend.ISystemSuspend/default                        u:object_r:hal_system_suspend_service:s0
+android.system.vold.IVold/default                                    u:object_r:fwk_vold_service:s0
 
 accessibility                             u:object_r:accessibility_service:s0
 account                                   u:object_r:account_service:s0