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/tap_esc/tap_esc.cpp

@@ -33,11 +33,11 @@
 
 #include <stdint.h>
 
-#include <px4_defines.h>
-#include <px4_module.h>
-#include <px4_tasks.h>
-#include <px4_getopt.h>
-#include <px4_posix.h>
+#include <px4_platform_common/defines.h>
+#include <px4_platform_common/module.h>
+#include <px4_platform_common/tasks.h>
+#include <px4_platform_common/getopt.h>
+#include <px4_platform_common/posix.h>
 #include <errno.h>
 
 #include <cmath>	// NAN
@@ -46,7 +46,7 @@
 #include <lib/mathlib/mathlib.h>
 #include <lib/cdev/CDev.hpp>
 #include <perf/perf_counter.h>
-#include <px4_module_params.h>
+#include <px4_platform_common/module_params.h>
 #include <uORB/Subscription.hpp>
 #include <uORB/topics/actuator_controls.h>
 #include <uORB/topics/actuator_outputs.h>

src/drivers/tap_esc/tap_esc_common.cpp

@@ -42,8 +42,8 @@
 #include <termios.h>
 
 #include <systemlib/px4_macros.h> // arraySize
-#include <px4_config.h>
-#include <px4_defines.h>
+#include <px4_platform_common/px4_config.h>
+#include <px4_platform_common/defines.h>
 
 #ifndef B250000
 #define B250000 250000