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/px4iofirmware/adc.c

@@ -36,7 +36,7 @@
  *
  * Simple ADC support for PX4IO on STM32.
  */
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 #include <stdint.h>
 
 #include <nuttx/arch.h>

src/modules/px4iofirmware/controls.c

@@ -39,7 +39,7 @@
  * @author Lorenz Meier <lorenz@px4.io>
  */
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 #include <stdbool.h>
 
 #include <drivers/drv_hrt.h>

src/modules/px4iofirmware/mixer.cpp

@@ -39,7 +39,7 @@
  * @author Lorenz Meier <lorenz@px4.io>
  */
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 #include <syslog.h>
 
 #include <sys/types.h>

src/modules/px4iofirmware/px4io.c

@@ -38,7 +38,7 @@
  * @author Lorenz Meier <lorenz@px4.io>
  */
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 #include "platform/cxxinitialize.h"
 
 #include <stdio.h>	// required for task_create

src/modules/px4iofirmware/px4io.h

@@ -41,7 +41,7 @@
 
 #pragma once
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 
 #include <stdbool.h>
 #include <stdint.h>

src/modules/px4iofirmware/registers.c

@@ -39,7 +39,7 @@
  * @author Lorenz Meier <lorenz@px4.io>
  */
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 
 #include <stdbool.h>
 #include <stdlib.h>

src/modules/px4iofirmware/safety.c

@@ -38,7 +38,7 @@
  * @author Lorenz Meier <lorenz@px4.io>
  */
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 
 #include <stdbool.h>