Remove 'name' from EngineConfig::AttributesGroup.

The 'name' variable is ignored by the engine when loading the audio policy engine config (i.e. the framework does nothing with it). Furthermore, it does not exist in the audio_policy_engine_configuration.xsd.

Test: m
Merged-In: I787b8db2c9091936511934853577c7531fd3cb39
Change-Id: I787b8db2c9091936511934853577c7531fd3cb39
(cherry picked from commit 23bca505)