src/platforms: move all headers to platforms/common/include/px4_platform_common

and remove the px4_ prefix, except for px4_config.h.

command to update includes:
for k in app.h atomic.h cli.h console_buffer.h defines.h getopt.h i2c.h init.h log.h micro_hal.h module.h module_params.h param.h param_macros.h posix.h sem.h sem.hpp shmem.h shutdown.h tasks.h time.h workqueue.h; do for i in $(grep -rl 'include <px4_'$k src platforms boards); do sed -i 's/#include <px4_'$k'/#include <px4_platform_common\/'$k/ $i; done; done
for in $(grep -rl 'include <px4_config.h' src platforms boards); do sed -i 's/#include <px4_config.h/#include <px4_platform_common\/px4_config.h'/ $i; done

Transitional headers for submodules are added (px4_{defines,log,time}.h)

src/lib/parameters/ParameterTest.cpp

@@ -31,7 +31,7 @@
  *
  ****************************************************************************/
 
-#include <px4_module_params.h>
+#include <px4_platform_common/module_params.h>
 #include <uORB/Subscription.hpp>
 #include <uORB/topics/obstacle_distance.h>
 #include <uORB/uORBManager.hpp>

src/lib/parameters/flashparams/flashfs.c

@@ -42,8 +42,8 @@
  * foot print device.
  */
 
-#include <px4_defines.h>
-#include <px4_posix.h>
+#include <px4_platform_common/defines.h>
+#include <px4_platform_common/posix.h>
 #include <crc32.h>
 #include <stddef.h>
 #include <string.h>

src/lib/parameters/flashparams/flashparams.cpp

@@ -42,9 +42,9 @@
  * foot print device.
  */
 
-#include <px4_defines.h>
-#include <px4_posix.h>
-#include <px4_shutdown.h>
+#include <px4_platform_common/defines.h>
+#include <px4_platform_common/posix.h>
+#include <px4_platform_common/shutdown.h>
 
 #include <string.h>
 #include <stdbool.h>

src/lib/parameters/parameters.cpp

@@ -51,11 +51,11 @@
 
 #include <drivers/drv_hrt.h>
 #include <lib/perf/perf_counter.h>
-#include <px4_config.h>
-#include <px4_defines.h>
-#include <px4_posix.h>
-#include <px4_sem.h>
-#include <px4_shutdown.h>
+#include <px4_platform_common/px4_config.h>
+#include <px4_platform_common/defines.h>
+#include <px4_platform_common/posix.h>
+#include <px4_platform_common/sem.h>
+#include <px4_platform_common/shutdown.h>
 #include <systemlib/uthash/utarray.h>
 
 using namespace time_literals;
@@ -91,7 +91,7 @@ static char *param_user_file = nullptr;
 #endif
 
 #ifndef PARAM_NO_AUTOSAVE
-#include <px4_workqueue.h>
+#include <px4_platform_common/workqueue.h>
 /* autosaving variables */
 static hrt_abstime last_autosave_timestamp = 0;
 static struct work_s autosave_work {};

src/lib/parameters/parameters_shmem.cpp

@@ -50,11 +50,11 @@
 #include <math.h>
 
 #include <drivers/drv_hrt.h>
-#include <px4_config.h>
-#include <px4_defines.h>
-#include <px4_posix.h>
-#include <px4_sem.h>
-#include <px4_shutdown.h>
+#include <px4_platform_common/px4_config.h>
+#include <px4_platform_common/defines.h>
+#include <px4_platform_common/posix.h>
+#include <px4_platform_common/sem.h>
+#include <px4_platform_common/shutdown.h>
 
 #include <perf/perf_counter.h>
 #include <systemlib/uthash/utarray.h>
@@ -73,7 +73,7 @@
 
 #include <sys/stat.h>
 
-#include "shmem.h"
+#include <px4_platform_common/shmem.h>
 
 #ifdef __PX4_QURT
 static const char *param_default_file = "/dev/fs/params";
@@ -91,7 +91,7 @@ static char *param_user_file = nullptr;
 #define PARAM_CLOSE	close
 
 #ifndef PARAM_NO_AUTOSAVE
-#include <px4_workqueue.h>
+#include <px4_platform_common/workqueue.h>
 /* autosaving variables */
 static hrt_abstime last_autosave_timestamp = 0;
 static struct work_s autosave_work;

src/lib/parameters/tinybson/tinybson.cpp

@@ -37,7 +37,7 @@
  * A simple subset SAX-style BSON parser and generator.
  */
 
-#include <px4_posix.h>
+#include <px4_platform_common/posix.h>
 #include <unistd.h>
 #include <string.h>
 #include <stdlib.h>