Add NNAPI specification and infrastructure for FL7.

Adds operations MIRROR_PAD and REVERSE.
Extends RSQRT to support QUANT8_ASYMM and QUANT8_ASYMM_SIGNED.

DOES NOT include tests or CPU reference implementation.

Bug: 202280917

Test: NeuralNetworksTest_static
Test: VtsHalNeuralnetworksTargetTest

Merged-In: I0b2133346b996849faac00c46885e3633c78f024
Change-Id: I0b2133346b996849faac00c46885e3633c78f024
(cherry picked from commit 04ed8595)