Remove bootloader logic from mcu_selection.mk (#20150)

* Remove bootloader logic from mcu_selection.mk

* Move MCU/BOOTLOADER to info.json

keyboards/doio/kb16/rev2/rules.mk

@@ -1,18 +1,8 @@
 SRC += ./lib/layer_status/layer_status.c
 SRC += ./lib/logo.c
 
-# MCU name
-MCU = STM32F103
-
-# Bootloader selection
-# Cannot use `BOOTLOADER = stm32duino` due to the need to override
-# `MCU_LDSCRIPT`, therefore all parameters need to be specified here manually.
-OPT_DEFS += -DBOOTLOADER_STM32DUINO
-MCU_LDSCRIPT = STM32F103xB_stm32duino_bootloader
-BOARD = STM32_F103_STM32DUINO
-BOOTLOADER_TYPE = stm32duino
-DFU_ARGS = -d 1EAF:0003 -a 2 -R
-DFU_SUFFIX_ARGS = -v 1EAF -p 0003
+# Configure for 128K flash
+MCU_LDSCRIPT = STM32F103xB
 
 # Build Options
 #   change yes to no to disable