Audio: Copier: Remove not necessary header for testbench build

The include of dai-zephyr.h causes IPC4 testbench build to
fail due to further include of Zephyr headers. Since the
copier_generic.c build is not needing it, it can be removed.

The HiFi build version copier_hifi.c is already without
this include.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

src/audio/copier/copier_generic.c

@@ -10,7 +10,6 @@
 #include <sof/common.h>
 #include <ipc/dai.h>
 #include "copier.h"
-#include <sof/lib/dai-zephyr.h>
 
 LOG_MODULE_DECLARE(copier, CONFIG_SOF_LOG_LEVEL);