Remove neuralnetworks@1.3::Model.Extension* in favor of 1.2 counterparts

The types are the same as in 1.2. No changes are expected.

Bug: 136735929
Test: m
Change-Id: I7431d2e9263fafa0e63b8b1b40f6715e3832d17c
Merged-In: I7431d2e9263fafa0e63b8b1b40f6715e3832d17c
(cherry picked from commit 8a179f34995909213055af7817d305f7c5cc6577)
3 files changed