Revert "Add libneuralnetworks_shim.so to requireLibs."

This reverts commit 14f6751d.

Reason for revert: Removing libneuralnetworks_shim.so from Android S

Ignore-AOSP-First: This change is being submitted to sc-dev, which no
longer automerges from AOSP. The AOSP change is separately being
submitted in aosp/1711709

Bug: 188587379
Test: mma
Change-Id: I23acbdc31ddc488ad59225b483936905fa3652ee