NNAPI: Clarify behaviour of ops that reduce dimensions

Clarify behaviour of the following ops in the case when inputs would
cause an output to have an empty shape:
* MEAN
* ARGMIN/ARGMAX
* STRIDED_SLICE

Bug: 155508675
Bug: 155660285
Bug: 155508675
Bug: 155238914
Test: VtsHalNeuralnetworksV1_3TargetTest
Change-Id: I92d1c3866a462a99b4eed7782b72f62bb6a076c6
Merged-In: I92d1c3866a462a99b4eed7782b72f62bb6a076c6
(cherry picked from commit d4bba83f6a441b49e07d0656b3febd9c706cd28a)
GitOrigin-RevId: d90a5de79135a3a0f0e65332a8a6373f4ca7f2d8
3 files changed
tree: 70220cb1927667dbc36600e8ed60a79d5585e4cb
  1. 1.0/
  2. 1.1/
  3. 1.2/
  4. 1.3/
  5. README
  6. TEST_MAPPING