initial minimal PX4_ROS2 platform and px4_ros2_default build (#20689)

- new ROS2 platform in PX4 intended for creating configs that build and run entirely in ROS2
 - PX4_CONFIG defaults to px4_ros2_default if no config specified and in a colcon workspace with ROS_VERSION=2
 - currently doesn't do much other than allow you to build px4 msgs interface package

platforms/nuttx/src/canbootloader/arch/nxp/s32k14x/drivers/can/driver.c

@@ -53,7 +53,7 @@
 #include <arch/board/board.h>
 #include "flexcan.h"
 
-#include <lib/systemlib/crc.h>
+#include <lib/crc/crc.h>
 
 
 #define CAN_TX_TIMEOUT_MS     (200 /(1000/(1000000/CONFIG_USEC_PER_TICK)))

platforms/nuttx/src/canbootloader/arch/stm/stm32f4/drivers/can/driver.c

@@ -55,7 +55,7 @@
 
 #include <arch/board/board.h>
 
-#include <lib/systemlib/crc.h>
+#include <lib/crc/crc.h>
 
 #define INAK_TIMEOUT          65535
 

platforms/nuttx/src/canbootloader/arch/stm/stm32f7/drivers/can/driver.c

@@ -54,7 +54,7 @@
 
 #include <arch/board/board.h>
 
-#include <lib/systemlib/crc.h>
+#include <lib/crc/crc.h>
 
 #define INAK_TIMEOUT          65535
 

platforms/nuttx/src/canbootloader/protocol/uavcan.c

@@ -49,7 +49,7 @@
 #include "uavcan.h"
 #include "can.h"
 
-#include <lib/systemlib/crc.h>
+#include <lib/crc/crc.h>
 
 #define CAN_REQUEST_TIMEOUT 1000
 #define ANY_NODE_ID 0

platforms/nuttx/src/canbootloader/uavcan/main.c

@@ -58,7 +58,7 @@
 #include <drivers/bootloaders/boot_app_shared.h>
 #include <drivers/bootloaders/boot_alt_app_shared.h>
 #include <drivers/drv_watchdog.h>
-#include <lib/systemlib/crc.h>
+#include <lib/crc/crc.h>
 
 //#define DEBUG_APPLICATION_INPLACE    1 /* Never leave defined */
 #define DEBUG_NO_FW_UPDATE           1 /* With DEBUG_APPLICATION_INPLACE