Move NNAPI HAL CommonUtils to nnapi/SharedMemory -- hal

This CL relocates utility code that transfers data between pointer-based
memory and shared memory for Request objects and Model objects, moving
it from nnapi/hal/CommonUtils.h (hal utilities) to nnapi/SharedMemory.h
(canonical library).

This change also adds a check for whether Model and Requests have
pointer-based data in neuralnetworks/aidl/utils/src/Conversions.cpp to
make it consistent with the HIDL utility conversions.

Bug: 217217023
Test: mma
Test: presubmit
Change-Id: I55a0fea186708d806bc709681e10027a9e4b0ffb