include: sof: trace: don't place trace ctx in special section

If trace is disabled (i.e: CONFIG_TRACE=n) there's no need
to place the trace context inside a special linker section
(i.e: .trace_ctx). This spares platforms that don't use trace
from having to include the .trace_ctx section inside their
linker scripts.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>

src/include/sof/trace/trace.h

@@ -393,7 +393,7 @@ struct tr_ctx {
 	uint32_t level;				/**< Default log level */
 };
 
-#if defined(UNIT_TEST)
+#if defined(UNIT_TEST) || !defined(CONFIG_TRACE)
 #define TRACE_CONTEXT_SECTION
 #else
 #define TRACE_CONTEXT_SECTION __section(".trace_ctx")