This patch added callbacks for rate locking and rate reset and fixed
an initialisation problem from envy24control.
If we have a default rate from e.g. 96000 and a stream is playing with
e.g. 48000 an we start envy24control then the value 48000 is set
as default rate.
The second patch is for envy24control. this patch uses the new driver
design. it is not necessary to give the parameters for inputs and/or
outputs. only the available controls given by the driver will be displayed.
this patch needs the kernel driver patch.
