Change NNAPI Memory to ref-counted SharedMemory -- runtime

Bug: 179906132
Test: mma
Test: NeuralNetworksTest_static
Test: presubmit
Change-Id: Icf335370631e34730cf0fe6a11b850884e50ac53
Merged-In: Icf335370631e34730cf0fe6a11b850884e50ac53
(cherry picked from commit b470600e8d7dd65738b0680e11f852062fee0494)
28 files changed