AudioFlinger: Clean up Effect configuration macros

Multichannel float mode is the only configuration supported.

Test: Compile and check that libaudioflinger.so size does not change.
Bug: 284009360
Merged-In: If2cdda0fac533b8aa59f1e5d44bdc3e7f06001ee
Change-Id: If2cdda0fac533b8aa59f1e5d44bdc3e7f06001ee
6 files changed