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/modules/muorb/test/muorb_test_example.cpp

@@ -39,10 +39,10 @@
  */
 
 #include "muorb_test_example.h"
-#include <px4_log.h>
+#include <px4_platform_common/log.h>
 #include <unistd.h>
 #include <stdio.h>
-#include <px4_defines.h>
+#include <px4_platform_common/defines.h>
 #include <uORB/Publication.hpp>
 #include <uORB/PublicationQueued.hpp>
 #include <uORB/Subscription.hpp>

src/modules/muorb/test/muorb_test_example.h

@@ -39,7 +39,7 @@
  */
 #pragma once
 
-#include <px4_app.h>
+#include <px4_platform_common/app.h>
 #include "uORB/topics/esc_status.h"
 #include "uORB/topics/vehicle_command.h"
 

src/modules/muorb/test/muorb_test_main.cpp

@@ -37,9 +37,9 @@
  *
  * @author Mark Charlebois <charlebm@gmail.com>
  */
-#include <px4_log.h>
-#include <px4_app.h>
-#include <px4_init.h>
+#include <px4_platform_common/log.h>
+#include <px4_platform_common/app.h>
+#include <px4_platform_common/init.h>
 #include "muorb_test_example.h"
 #include <stdio.h>
 #include "uORB/uORBManager.hpp"

src/modules/muorb/test/muorb_test_start_posix.cpp

@@ -38,9 +38,9 @@
  * @author Mark Charlebois <mcharleb@gmail.com>
  */
 #include "muorb_test_example.h"
-#include <px4_log.h>
-#include <px4_app.h>
-#include <px4_tasks.h>
+#include <px4_platform_common/log.h>
+#include <px4_platform_common/app.h>
+#include <px4_platform_common/tasks.h>
 #include <stdio.h>
 #include <string.h>
 #include <sched.h>