Mark cn-cbor_test as not gtest am: 97c813c112 am: e665ba070a

Original change: https://android-review.googlesource.com/c/platform/external/cn-cbor/+/1581965

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia0e166b0785ec846dbab0ec8a15141f615e2230c