cmake/zephyr: unify cmake rules for src/trace

Adding all source files in a single, giant zephyr/CMakeLists.txt is
inconvenient and does not scale.

Modify Zephyr rules to use definitions in src/trace/ instead.

Link: #8260
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

src/trace/CMakeLists.txt

@@ -1,3 +1,5 @@
 # SPDX-License-Identifier: BSD-3-Clause
 
-add_local_sources(sof dma-trace.c trace.c)
+if(CONFIG_TRACE)
+  add_local_sources(sof dma-trace.c trace.c)
+endif()

zephyr/CMakeLists.txt

@@ -211,9 +211,9 @@ add_subdirectory(../src/ipc/  ipc_unused_install/)
 add_subdirectory(../src/lib/ lib_unused_install/)
 add_subdirectory(../src/library_manager/ library_manager_unused_install/)
 add_subdirectory(../src/schedule/  schedule_unused_install/)
+add_subdirectory(../src/trace/ trace_unused_install/)
 add_subdirectory(test/)
 
-
 # Old way below: all .c files added by this giant CMake file.
 
 # Intel TGL and CAVS 2.5 platforms
@@ -476,10 +476,6 @@ zephyr_library_sources(
 # SOF module interface functions
 add_subdirectory(../src/module module_unused_install/)
 
-zephyr_library_sources_ifdef(CONFIG_TRACE
-	${SOF_SRC_PATH}/trace/dma-trace.c
-	${SOF_SRC_PATH}/trace/trace.c)
-
 zephyr_library_sources_ifdef(CONFIG_LOG_BACKEND_SOF_PROBE
       ${SOF_SRC_PATH}/logging/log_backend_probe.c)