Remove bootloader logic from mcu_selection.mk (#20150)

* Remove bootloader logic from mcu_selection.mk

* Move MCU/BOOTLOADER to info.json

keyboards/rocketboard_16/info.json

@@ -8,6 +8,8 @@
         "pid": "0xFF16",
         "device_version": "0.0.1"
     },
+    "processor": "STM32F103",
+    "bootloader": "stm32duino",
     "matrix_pins": {
         "cols": ["B8", "B9", "B10", "B11"],
         "rows": ["A9", "B13", "B14", "B15", "B3"]

keyboards/rocketboard_16/rules.mk

@@ -1,16 +1,5 @@
-# MCU name
-MCU = STM32F103
-
-# Bootloader selection
-# BOOTLOADER = stm32duino
-
-# Custom loader configuration
-MCU_LDSCRIPT = STM32F103xB_stm32duino_bootloader
-OPT_DEFS += -DBOOTLOADER_STM32DUINO
-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
 
 # Extra include
 SRC += keycode_lookup.c