px4_middleware: remove that header and move px4::init to px4_init.h

delete include:
for i in $(grep -rl 'px4_middleware.h' src platforms); do sed -i '/#include <px4_middleware.h/d' $i; done

src/drivers/pwm_out_sim/PWMSim.hpp

@@ -41,7 +41,6 @@
 #include <drivers/drv_pwm_output.h>
 #include <lib/mixer/mixer.h>
 #include <perf/perf_counter.h>
-#include <px4_common.h>
 #include <px4_config.h>
 #include <px4_module.h>
 #include <px4_tasks.h>

src/drivers/qshell/qurt/qshell.cpp

@@ -43,7 +43,6 @@
 #include <px4_log.h>
 #include <px4_time.h>
 #include <px4_posix.h>
-#include <px4_middleware.h>
 #include <px4_defines.h>
 #include <dspal_platform.h>
 

src/drivers/qshell/qurt/qshell_main.cpp

@@ -38,9 +38,9 @@
  * @author Nicolas de Palezieux <ndepal@gmail.com>
  */
 
-#include <px4_middleware.h>
 #include <px4_log.h>
 #include <px4_app.h>
+#include <px4_init.h>
 #include "qshell.h"
 
 extern "C" __EXPORT int qshell_entry(int argc, char **argv);

src/drivers/qurt/tests/hello/hello_main.cpp

@@ -37,9 +37,9 @@
  *
  * @author Mark Charlebois <charlebm@gmail.com>
  */
-#include <px4_middleware.h>
 #include <px4_log.h>
 #include <px4_app.h>
+#include <px4_init.h>
 #include "hello_example.h"
 #include <stdio.h>
 

src/drivers/qurt/tests/muorb/muorb_test_main.cpp

@@ -37,9 +37,9 @@
  *
  * @author Mark Charlebois <charlebm@gmail.com>
  */
-#include <px4_middleware.h>
 #include <px4_log.h>
 #include <px4_app.h>
+#include <px4_init.h>
 #include "muorb_test_example.h"
 
 extern "C" __EXPORT int muorb_test_entry(int argc, char **argv);

src/drivers/qurt/tests/muorb/muorb_test_start_qurt.cpp

@@ -39,6 +39,7 @@
 #include "muorb_test_example.h"
 #include <px4_log.h>
 #include <px4_app.h>
+#include <px4_init.h>
 #include <px4_tasks.h>
 #include <stdio.h>
 #include <string.h>