msm: audio: Use adsp as a string param for pil_get function for 8974

For 8974 target, pil_get function uses "adsp" string as a param, for
other targets it uses "q6", for pil_get to succeed, we need to try
with both strings before we return an error.

Change-Id: Ia1e05f9ce4d9f09165bdfbd1c68cad9136d62b0f
Signed-off-by: Harmandeep Singh <hsingh@codeaurora.org>