Libaudiohal: only match haptic port if haptic channel mask is requested.

Haptic mix port usually doesn't contain an output flag but it can be
identified by the channel mask. If the request doesn't contain haptic
channel mask, there is no need to use haptic mix port as there should be
some other mix port will be matched.

Bug: 251215866
Test: make
Change-Id: I472fed3e10cd6d5d5864de9eb9328f634db949fb