Clean up AIDL utility code

This change removes references to CpuExecutor.h and LegacyUtils.h from
the Aidl* source files. This is part of a broader effort to relocate the
Aidl utility code to hardware/interfaces/neuralnetworks/aidl/utils so
that libneuralnetworks_common does not rely on AIDL functionality.

Bug: N/A
Test: mma
Test: NeuralNetworksTest_static
Test: VtsHalNeuralnetworksTargetTest
Change-Id: Id8f462340ff9dcf63bbfa907f5fd49eed2f2440f
10 files changed