AP_Notify: stop using linux board subtype in Notify LED setup

... instead have the board definitions define things like we do for ChibiOS

libraries/AP_Notify/Led_Sysfs.cpp

@@ -14,13 +14,12 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#include <AP_HAL/AP_HAL.h>
+#include "AP_Notify_config.h"
+
+#if AP_NOTIFY_SYSFS_LED_ENABLED
 
-#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX
 #include "Led_Sysfs.h"
 
-#include <AP_HAL_Linux/Led_Sysfs.h>
-
 Led_Sysfs::Led_Sysfs(const char *red, const char *green, const char *blue,
                     uint8_t off_brightness, uint8_t low_brightness, uint8_t medium_brightness, uint8_t high_brightness):
     RGBLed(off_brightness, high_brightness, medium_brightness, low_brightness),
@@ -47,4 +46,4 @@ bool Led_Sysfs::hw_set_rgb(uint8_t red, uint8_t green, uint8_t blue)
 
     return true;
 }
-#endif
+#endif  // AP_NOTIFY_SYSFS_LED_ENABLED