Set `BOOTLOADER = stm32-dfu` for all applicable STM32 boards (#12956)

* Set bootloader to stm32-dfu for STM32F303

* Set bootloader to stm32-dfu for STM32F0x2

* Set bootloader to stm32-dfu for STM32F4x1

* Set bootloader to stm32duino for sowbug

* Delete redundant bootloader_defs headers

* Add some missing MCU name comments

* Move APM32 dfu-suffix overrides underneath bootloader

* Remove redundant STM32_BOOTLOADER_ADDRESS defines/rules

1 files changed, 6 insertions, 3 deletions

diff --git a/keyboards/cannonkeys/instant60/rules.mk b/keyboards/cannonkeys/instant60/rules.mk
index e5ba2903b..81ee89594 100644
--- a/keyboards/cannonkeys/instant60/rules.mk
+++ b/keyboards/cannonkeys/instant60/rules.mk
@@ -1,6 +1,12 @@
 # MCU name
 MCU = STM32F072
 
+# Bootloader selection
+BOOTLOADER = stm32-dfu
+
+# Wildcard to allow APM32 MCU
+DFU_SUFFIX_ARGS = -v FFFF -p FFFF
+
 # Build Options
 #   comment out to disable the options.
 #
@@ -19,8 +25,5 @@ WS2812_DRIVER = spi
 
 LAYOUTS = 60_ansi 60_tsangan_hhkb
 
-# Wildcard to allow APM32 MCU 
-DFU_SUFFIX_ARGS = -p FFFF -v FFFF
-
 # Enter lower-power sleep mode when on the ChibiOS idle thread
 OPT_DEFS += -DCORTEX_ENABLE_WFI_IDLE=TRUE