audio: enable loading ADSP image during bootup

Earlier ADSP image was loaded when pcm_open was
called for the first time. This caused the first
audio playback to be delayed. To fix this, adsp_loader
is modified to load ADSP firmware using pil.

Bug:8204207

Change-Id: I602c6784acb4bf71ffc8f4063134ad9d45515fd7
1 file changed