ASoC: dsp: Synchronise adm and rtac commands

Race condition observed while processing the
set_pp_params command responses sent back to back
by adsp for commands sent from adm and rtac.
Handle this by synchronising the get/set pp_params
command in both the drivers.

Change-Id: Id89d98217dc5cad3703e5d545ddee21cb145c874
Signed-off-by: Soumya Managoli <smanag@codeaurora.org>