NN 1.3 HAL: ANAPIC review follow up

This CL makes the following three interface changes:
* Removes @1.3::Operand.ExtraParams, because it was the same as
  @1.2::Operand.ExtraParams
* Changes int32_t token to uint32_t for IDevice::allocate and for
  @1.3::Request.MemoryPool
* Renames OptionalTimePoint::nanoseconds to
  OptionalTimePoint::nanosecondsSinceEpoch

This CL also makes test changes in response to the interface changes,
and fixes a minor comment issue in @1.2::types.hal and @1.3::types.hal.

Bug: 148617339
Test: mma
Test: VtsHalNeuralnetworksV1_3TargetTest
Change-Id: I95b49ab34b0b79f587dda035ede700b73dc44a38
Merged-In: I95b49ab34b0b79f587dda035ede700b73dc44a38
(cherry picked from commit 6a4172cd)