Add bluepill/blackpill development board presets (#16806)

data/mappings/defaults.json

@@ -15,6 +15,21 @@
             "bootloader": "stm32-dfu",
             "board": "QMK_PROTON_C",
             "pin_compatible": "promicro"
+        },
+        "bluepill": {
+            "processor": "STM32F103",
+            "bootloader": "stm32duino",
+            "board": "STM32_F103_STM32DUINO"
+        },
+        "blackpill_f401": {
+            "processor": "STM32F401",
+            "bootloader": "stm32-dfu",
+            "board": "BLACKPILL_STM32_F401"
+        },
+        "blackpill_f411": {
+            "processor": "STM32F411",
+            "bootloader": "stm32-dfu",
+            "board": "BLACKPILL_STM32_F411"
         }
     }
 }

data/schemas/keyboard.jsonschema

@@ -14,7 +14,7 @@
         },
         "development_board": {
             "type": "string",
-            "enum": ["promicro", "elite_c", "proton_c"]
+            "enum": ["promicro", "elite_c", "proton_c", "bluepill", "blackpill_f401", "blackpill_f411"]
         },
         "pin_compatible": {
             "type": "string",