Revert "dummy audio ioctl's that return EINVAL"


dummy ioctls (returning -EINVAL) are already provided by the
v4l2-framework, so shan't duplicate it here (esp. since the
function-signature has changed with recent kernels)

This reverts commit 591c3791544b336ad6f54f2fd11003db8fcd1b0d.
fix missing spin lock init

Signed-off-by: Anatolij Gustschin <agust@denx.de>
add newlines to debug statements

It is quite difficult to read the debug output without
newlines in the debug statements. Improve it.

Signed-off-by: Anatolij Gustschin <agust@denx.de>