sound: usb: Add snapshot of usb audio qmi service

This change adds snapshot of usb audio qmi service related files.
Usb audio device enumeration remote entity communicates with usb
audio qmi server to enable or disable particular audio stream on
usb audio device. This offloads ISOC data transfer operations
to remote entity and allows apps processor to go to power collapse
more frequently for better power saving. This snapshot is taken as
of msm-4.9 commit c9738304eb08 ("qseecom: block system signals when
waiting for listener available"). This change also fixes reported
minor errors related to coding style and kzalloc() usage.

Change-Id: I8e002f1e1936a03b1a0c585a61d0340e4a00a192
Signed-off-by: Mayank Rana <mrana@codeaurora.org>