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)

msg/templates/uorb/msg.cpp.em

@@ -67,8 +67,8 @@ topic_fields = ["%s %s" % (convert_type(field.type), field.name) for field in so
 }@
 
 #include <inttypes.h>
-#include <px4_log.h>
-#include <px4_defines.h>
+#include <px4_platform_common/log.h>
+#include <px4_platform_common/defines.h>
 #include <uORB/topics/@(topic_name).h>
 #include <drivers/drv_hrt.h>
 #include <lib/drivers/device/Device.hpp>

msg/templates/uorb_microcdr/msg.cpp.em

@@ -61,7 +61,7 @@ uorb_struct = '%s_s'%spec.short_name
 topic_name = spec.short_name
 }@
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 #include <ucdr/microcdr.h>
 #include <uORB/topics/@(topic_name).h>
 #include <uORB_microcdr/topics/@(topic_name).h>

msg/templates/urtps/microRTPS_transport.cpp

@@ -36,9 +36,9 @@
 #include <errno.h>
 #include <sys/socket.h>
 #include <cstdlib>
-#if __has_include("px4_log.h") && __has_include("px4_time.h")
-#include <px4_log.h>
-#include <px4_time.h>
+#if __has_include("px4_platform_common/log.h") && __has_include("px4_platform_common/time.h")
+#include <px4_platform_common/log.h>
+#include <px4_platform_common/time.h>
 #endif
 
 #include "microRTPS_transport.h"