Hi Fi Berry Dac2HD kernel fix

@spockfish just came across this.

May be related to the kernel upgrade issue with the DAC2 HD that was reported here.

This patch is already applied, but unfortunately that’s not the only problem…

The mixer issue is something that Hifiberry needs to fix and I’m afraid this will happen only when Hifiberry upgrades the kernel for their OS (RoPieee uses a newer one).

I’m monitoring this closely, but so far nothing on their end.