Allow any mode when checking DICE chain

The mode is a value in a certificate that lives in a DICE chain. It
could be "normal" or "debug", for example. When running VTS, the mode
need not be "normal".

Test: atest VtsHalRemotelyProvisionedComponentTargetTest
      atest libkeymint_remote_prov_support_test
Bug: 386855891
Change-Id: Idb1c86b29393aec822d58d21c36ca2f8310d9054