create PX4 platform layer initialization helper (#11269)

- starts requirements for PX4 modules (hrt, param, etc)

platforms/qurt/src/px4_layer/CMakeLists.txt

@@ -44,6 +44,7 @@ set(QURT_LAYER_SRCS
 	qurt_stubs.c
 	main.cpp
 	shmem_qurt.cpp
+	px4_init.cpp
 	)
 
 if ("${QURT_ENABLE_STUBS}" STREQUAL "1")

platforms/qurt/src/px4_layer/px4_init.cpp

@@ -0,0 +1,48 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2019 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#include "px4_init.h"
+
+#include <px4_config.h>
+#include <px4_defines.h>
+#include <drivers/drv_hrt.h>
+#include <lib/parameters/param.h>
+
+int px4_platform_init(void)
+{
+	hrt_init();
+
+	param_init();
+
+	return PX4_OK;
+}

platforms/qurt/src/px4_layer/px4_qurt_impl.cpp

@@ -51,7 +51,7 @@
 #include <parameters/param.h>
 #include "hrt_work.h"
 #include "px4_log.h"
-
+#include <px4_init.h>
 
 //extern pthread_t _shell_task_id;
 
@@ -105,8 +105,8 @@ void init_once(void)
 
 	work_queues_init();
 	hrt_work_queue_init();
-	hrt_init();
-	param_init();
+
+	px4_platform_init();
 }
 
 void init(int argc, char *argv[], const char *app_name)