audio: support set volume for app [1/2]

Signed-off-by: cjybyjk <cjybyjk@zjnu.edu.cn>
Change-Id: Ib390f003d36e4269168f04a89c8d200987ba7047
Signed-off-by: NurKeinNeid <mralexman3000@gmail.com>
Signed-off-by: Ayan Mukherjee <mukherjeeayan725@gmail.com>
11 files changed