Skipping CompareVBMeta() in VerifyVBMetaDataError test case

It has some random errors on the cloud, so skpping them for now.

Bug: 187303962
Test: atest --host \
      libfs_avb_internal_test:libfs_avb_internal_test.AvbUtilTest#VerifyVBMetaDataError
Change-Id: I658e3f052f99af645bdd44087f519d58acbe5641