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/simulator/gpssim/gpssim.cpp

@@ -37,8 +37,8 @@
  */
 
 #include <sys/types.h>
-#include <px4_defines.h>
-#include <px4_getopt.h>
+#include <px4_platform_common/defines.h>
+#include <px4_platform_common/getopt.h>
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdbool.h>
@@ -53,8 +53,8 @@
 #include <math.h>
 #include <unistd.h>
 #include <fcntl.h>
-#include <px4_config.h>
-#include <px4_tasks.h>
+#include <px4_platform_common/px4_config.h>
+#include <px4_platform_common/tasks.h>
 #include <drivers/drv_hrt.h>
 #include <drivers/device/device.h>
 #include <uORB/uORB.h>

src/modules/simulator/ledsim/led.cpp

@@ -37,7 +37,7 @@
  * LED driver.
  */
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 #include <drivers/drv_board_led.h>
 #include <stdio.h>
 

src/modules/simulator/simulator.cpp

@@ -39,9 +39,9 @@
  * such as jMAVSim or Gazebo.
  */
 
-#include <px4_log.h>
-#include <px4_tasks.h>
-#include <px4_time.h>
+#include <px4_platform_common/log.h>
+#include <px4_platform_common/tasks.h>
+#include <px4_platform_common/time.h>
 #include <pthread.h>
 #include <poll.h>
 #include <systemlib/err.h>

src/modules/simulator/simulator.h

@@ -51,8 +51,8 @@
 #include <lib/drivers/magnetometer/PX4Magnetometer.hpp>
 #include <lib/ecl/geo/geo.h>
 #include <perf/perf_counter.h>
-#include <px4_module_params.h>
-#include <px4_posix.h>
+#include <px4_platform_common/module_params.h>
+#include <px4_platform_common/posix.h>
 #include <uORB/Subscription.hpp>
 #include <uORB/topics/actuator_outputs.h>
 #include <uORB/topics/battery_status.h>

src/modules/simulator/simulator_mavlink.cpp

@@ -34,9 +34,9 @@
  ****************************************************************************/
 
 #include <termios.h>
-#include <px4_log.h>
-#include <px4_time.h>
-#include <px4_tasks.h>
+#include <px4_platform_common/log.h>
+#include <px4_platform_common/time.h>
+#include <px4_platform_common/tasks.h>
 #include "simulator.h"
 #include <simulator_config.h>
 #include "errno.h"