ASoC: SOF: Clone the trace code to ipc3-dtrace as fw_tracing implementation

The existing trace.c file is implementing the IPC3 dma-trace support.

Clone the existing code with prefix fixes as ipc3 fw_tracing
implementation to be used when the core is converted to use generic ops
for firmware tracing.

Drop the dual licensing of the content as the implementation is based on
debugfs.

Signed-off-by: Peter Ujfalusi <[email protected]>
Reviewed-by: Ranjani Sridharan <[email protected]>
Reviewed-by: Bard Liao <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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