Define and add the migrate_any_key permission to system_server

This change adds a permission migrate_any_key that will help the system
server in migrating keys for an app that wants to leave a sharedUserId.

Bug: 179284822
Test: compiles
Change-Id: I2f35a1335092e69f5b3e346e2e27284e1ec595ec
diff --git a/private/access_vectors b/private/access_vectors
index 6edcd1f..afa42b0 100644
--- a/private/access_vectors
+++ b/private/access_vectors
@@ -727,6 +727,7 @@
 	get_state
 	list
 	lock
+	migrate_any_key
 	pull_metrics
 	report_off_body
 	reset
diff --git a/private/system_server.te b/private/system_server.te
index 4c87b3f..acefd3e 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -907,6 +907,7 @@
 	clear_uid
 	get_state
 	lock
+	migrate_any_key
 	pull_metrics
 	reset
 	unlock