Set correct max vol curve index for LEA

There could be an index mismatch between APM and AS if we do not set the
correct max vol curve index for LEA devices. This could end up in
suppressed volume commands to APM.

Test: manual
Bug: 435150134
Flag: EXEMPT bugfix
Change-Id: Icf6c9a6b7a4cc34b2156e40bcf296454f60b87f4