audio_hal: Refine audio HAL dump API on Linux. [2/2]

PD#TV-26173

Problem:
Audio HAL device dump API is used on Android dumpsys
and on Linux it does not work.

Solution:
Adjust the output return as string in same way as
get_parameters so client side can get the dump info.

Verify:
U212 local build with new added hal_dump command.

Change-Id: If7da58d9202cfc0de099459c6189af4f9da44f16
1 file changed
tree: bbd53d9c82cef2bc458ea6baf6189f4d3dd2b911
  1. include/
  2. src/
  3. Makefile