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/drivers/linux_pwm_out/PCA9685.cpp

@@ -51,7 +51,7 @@
 
 #include "PCA9685.h"
 
-#include <px4_log.h>
+#include <px4_platform_common/log.h>
 
 using namespace linux_pwm_out;
 

src/drivers/linux_pwm_out/bbblue_pwm_rc.cpp

@@ -34,7 +34,7 @@
 
 #include <fcntl.h>
 #include <errno.h>
-#include <px4_log.h>
+#include <px4_platform_common/log.h>
 
 #include <robotcontrol.h>
 #include <board_config.h>

src/drivers/linux_pwm_out/linux_pwm_out.cpp

@@ -38,9 +38,9 @@
 
 #include <cmath>
 
-#include <px4_tasks.h>
-#include <px4_getopt.h>
-#include <px4_posix.h>
+#include <px4_platform_common/tasks.h>
+#include <px4_platform_common/getopt.h>
+#include <px4_platform_common/posix.h>
 
 #include <uORB/Subscription.hpp>
 #include <uORB/topics/actuator_controls.h>

src/drivers/linux_pwm_out/navio_sysfs.cpp

@@ -36,7 +36,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <unistd.h>
-#include <px4_log.h>
+#include <px4_platform_common/log.h>
 
 using namespace linux_pwm_out;
 

src/drivers/linux_pwm_out/ocpoc_mmap.cpp

@@ -33,7 +33,7 @@
 
 #include "ocpoc_mmap.h"
 
-#include <px4_log.h>
+#include <px4_platform_common/log.h>
 
 #include <fcntl.h>
 #include <sys/mman.h>