bl_update: build and include board bootloader if config available

boards/holybro/durandal-v1/default.cmake

@@ -7,6 +7,7 @@ px4_add_board(
 	TOOLCHAIN arm-none-eabi
 	ARCHITECTURE cortex-m7
 	ROMFSROOT px4fmu_common
+	BUILD_BOOTLOADER
 	IO px4_io-v2_default
 	TESTING
 #	UAVCAN_INTERFACES 2  - No H7 or FD can support in UAVCAN

boards/holybro/durandal-v1/init/rc.board_defaults

@@ -4,6 +4,24 @@
 #------------------------------------------------------------------------------
 
 
+#
+# Bootloader upgrade
+#
+set BL_FILE /etc/extras/holybro_durandal-v1_bootloader.bin
+if [ -f $BL_FILE ]
+then
+	if param compare SYS_BL_UPDATE 1
+	then
+		param set SYS_BL_UPDATE 0
+		param save
+		echo "BL update..." >> $LOG_FILE
+		bl_update $BL_FILE
+		echo "BL update done" >> $LOG_FILE
+		reboot
+	fi
+fi
+unset BL_FILE
+
 if [ $AUTOCNF = yes ]
 then
 	# Enable IMU thermal control