ASOC: wcd934x: Fix finding of correct AMIC

During Tx path enablement, amic information is needed for proper
power level settings and for better performance. Existing API returns
incorrect amic information. Changes provide the correct amic information.

Change-Id: I18f3f35212cae47e5d944c2e075f03889147722b
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>