Makefile: add missing bootloader targets

Quite a few were missing, and everything on one line was hard to diff.

Makefile

@@ -1,6 +1,6 @@
 ############################################################################
 #
-# Copyright (c) 2015 - 2020 PX4 Development Team. All rights reserved.
+# Copyright (c) 2015 - 2024 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
@@ -323,7 +323,32 @@ px4io_update:
 	cp build/cubepilot_io-v2_default/cubepilot_io-v2_default.bin boards/cubepilot/cubeyellow/extras/cubepilot_io-v2_default.bin
 	git status
 
-bootloaders_update: ark_fmu-v6x_bootloader cuav_nora_bootloader cuav_x7pro_bootloader cubepilot_cubeorange_bootloader holybro_durandal-v1_bootloader holybro_kakuteh7_bootloader matek_h743_bootloader matek_h743-mini_bootloader matek_h743-slim_bootloader modalai_fc-v2_bootloader mro_ctrl-zero-classic_bootloader mro_ctrl-zero-h7_bootloader mro_ctrl-zero-h7-oem_bootloader mro_pixracerpro_bootloader px4_fmu-v6c_bootloader px4_fmu-v6u_bootloader px4_fmu-v6x_bootloader
+bootloaders_update: \
+	ark_fmu-v6x_bootloader \
+	ark_pi6x_bootloader \
+	cuav_nora_bootloader \
+	cuav_x7pro_bootloader \
+	cubepilot_cubeorange_bootloader \
+	cubepilot_cubeorangeplus_bootloader \
+	hkust_nxt-dual_bootloader \
+	hkust_nxt-v1_bootloader \
+	holybro_durandal-v1_bootloader \
+	holybro_kakuteh7_bootloader \
+	holybro_kakuteh7mini_bootloader \
+	holybro_kakuteh7v2_bootloader \
+	matek_h743_bootloader \
+	matek_h743-mini_bootloader \
+	matek_h743-slim_bootloader \
+	modalai_fc-v2_bootloader \
+	mro_ctrl-zero-classic_bootloader \
+	mro_ctrl-zero-h7_bootloader \
+	mro_ctrl-zero-h7-oem_bootloader \
+	mro_pixracerpro_bootloader \
+	px4_fmu-v6c_bootloader \
+	px4_fmu-v6u_bootloader \
+	px4_fmu-v6x_bootloader \
+	px4_fmu-v6xrt_bootloader \
+	siyi_n7_bootloader
 	git status
 
 .PHONY: coverity_scan