dsp: q6afe: Update lpass hw votes to maintain separate handles

lpass client handle variable stores latest lpass hw vote.
During PDR, core hw vote release proceed to call unvote
for stale handle since above variable is set to non-zero
as part of audio hm vote. Maintain separate handles for
respective lpass hw votes inorder to fix this.

Change-Id: I432ce38b253ce6d18a25f9845fa694912718c74f
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>