asoc: lahaina: remove defunct implementation of qos

Remove defunct implementation of front end qos
prepare function.
Add todo debug log to add the new QOS prepare
implementation.

Change-Id: I95893d0309d465100d7abbab5e1acf6269fd1cde
Signed-off-by: Vignesh Kulothungan <vigneshk@codeaurora.org>