zephyr: add sof/trace/preproc.h

Add Zephyr version of sof/trace/preproc.h interface. The full
preproc.h interface needed for CONFIG_TRACE is not duplicated
here, so this commit effectively prevents using CONFIG_TRACE
in Zephyr.

Link: thesofproject#9015
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

zephyr/include/sof/trace/preproc.h

@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright(c) 2024 Intel Corporation.
+ */
+
+#ifndef __SOF_TRACE_PREPROC_H__
+#define __SOF_TRACE_PREPROC_H__
+
+#ifdef CONFIG_TRACE
+#error "SOF dma-trace (CONFIG_TRACE) not supported in Zephyr builds. \
+	Please use CONFIG_ZEPHYR_LOG instead."
+#endif
+
+#ifndef CONFIG_ZEPHYR_LOG
+
+/*
+ * Unlike the XTOS version of this macro, this does not silence all
+ * compiler warnings about unused variables.
+ */
+#define SOF_TRACE_UNUSED(arg1, ...) ((void)arg1)
+
+#endif /* CONFIG_ZEPHYR_LOG */
+
+#endif /* __SOF_TRACE_PREPROC_H__ */