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
1 file changed