Add local impl of mapper for libhidlmemory

Support for local ashmem mapping for when the HIDL android.hidl.memory
implementation isn't installed on the device.

Test: atest CtsMediaAudioTestCases
Tets: remove android.hidl.memory@1.0-impl.so from device &&
      atest CtsMediaAudioTestCases && check for call_once log
Bug: 205764958
Change-Id: I62ee9810366b6dea9134c5bc65f9a0c5deb63d6f
2 files changed