lvm: Extend multichannel support to 24 channels

Bug: 177072588
Test: lvm/tests/build_and_run_all_unit_tests.sh
Test: lvm/tests/build_and_run_all_unit_tests_reverb.sh

Change-Id: I3f9852a5642ef8cb552d237a85f77a23563b2ccc
5 files changed