crossover: move header file to module folder

This is a clean up, purpose is declutter headers, toml files,
Readme.md etc per module basis, since today everything is scattered
in current code base.

Signed-off-by: Baofeng Tian <baofeng.tian@intel.com>

src/audio/crossover/crossover.c

@@ -12,7 +12,6 @@
 #include <sof/audio/pipeline.h>
 #include <sof/audio/ipc-config.h>
 #include <sof/math/crossover_common.h>
-#include <sof/audio/crossover/crossover.h>
 #include <sof/common.h>
 #include <rtos/panic.h>
 #include <sof/ipc/msg.h>
@@ -30,13 +29,15 @@
 #include <ipc/stream.h>
 #include <ipc/topology.h>
 #include <user/trace.h>
-#include <user/crossover.h>
 #include <user/eq.h>
 #include <errno.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <limits.h>
 
+#include "crossover_user.h"
+#include "crossover.h"
+
 LOG_MODULE_REGISTER(crossover, CONFIG_SOF_LOG_LEVEL);
 
 /* 948c9ad1-806a-4131-ad6c-b2bda9e35a9f */

src/include/sof/audio/crossover/crossover.h → src/audio/crossover/crossover.h

@@ -11,9 +11,10 @@
 #include <sof/math/iir_df2t.h>
 #include <sof/math/crossover_common.h>
 #include <sof/platform.h>
-#include <user/crossover.h>
 #include <stdint.h>
 
+#include "crossover_user.h"
+
 struct comp_buffer;
 struct comp_dev;
 

src/audio/crossover/crossover_generic.c

@@ -7,11 +7,12 @@
 #include <ipc/stream.h>
 #include <sof/audio/module_adapter/module/module_interface.h>
 #include <sof/audio/component.h>
-#include <sof/audio/crossover/crossover.h>
 #include <sof/audio/format.h>
 #include <sof/math/iir_df2t.h>
 #include <stdint.h>
 
+#include "crossover.h"
+
 /*
  * \brief Splits x into two based on the coefficients set in the lp
  *        and hp filters. The output of the lp is in y1, the output of