refactor param: move autosave to px4::wq_configurations::lp_default work queue

Changes initialization order as param_init now depends on wq manager

platforms/nuttx/src/px4/common/px4_init.cpp

@@ -127,8 +127,6 @@ int px4_platform_init()
 	hrt_ioctl_init();
 #endif
 
-	param_init();
-
 	/* configure CPU load estimation */
 #ifdef CONFIG_SCHED_INSTRUMENTATION
 	cpuload_initialize_once();
@@ -180,9 +178,10 @@ int px4_platform_init()
 
 #endif // CONFIG_FS_BINFS
 
-
 	px4::WorkQueueManagerStart();
 
+	param_init();
+
 	uorb_start();
 
 	px4_log_initialize();