we will use the same ring buffer size for all sub-devices

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
create a ringbuffer with a size of PAGE_SIZE

The smae is done in v4 kernel driver, but there we
have more (2) buffers which are handled in the ringbuffer.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
hmmm... the clocks and the dts are still a mess

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>