Correct protectionToString

The information of protectionLevel companion is missing when dumping
to string.

Bug: 161855740
Test: atest CtsPermission2TestCases:PermissionPolicyTest
Change-Id: Ifa9099541df1c287e5883a801ed14d34dad6287b
Merged-In: Ifa9099541df1c287e5883a801ed14d34dad6287b
diff --git a/core/java/android/content/pm/PermissionInfo.java b/core/java/android/content/pm/PermissionInfo.java
index 5f6befd..e990fd7 100644
--- a/core/java/android/content/pm/PermissionInfo.java
+++ b/core/java/android/content/pm/PermissionInfo.java
@@ -525,6 +525,9 @@
         if ((level & PermissionInfo.PROTECTION_FLAG_APP_PREDICTOR) != 0) {
             protLevel += "|appPredictor";
         }
+        if ((level & PermissionInfo.PROTECTION_FLAG_COMPANION) != 0) {
+            protLevel += "|companion";
+        }
         if ((level & PermissionInfo.PROTECTION_FLAG_RETAIL_DEMO) != 0) {
             protLevel += "|retailDemo";
         }