Fix a couple of boards being wrongly identified as AVR (#16377)

keyboards/mlego/m60_split/info.json

@@ -1,6 +1,5 @@
 {
     "keyboard_name": "mlego/m60_split",
-    "keyboard_folder": "mlego/m60_split",
     "url": "https://gitlab.com/m-lego/m65",
     "maintainer": "alin elena",
     "layouts": {

keyboards/splitkb/kyria/rev1/proton_c/rules.mk

@@ -1,3 +1,10 @@
+# MCU name
+MCU = STM32F303
+BOARD = QMK_PROTON_C
+
+# Bootloader selection
+BOOTLOADER = stm32-dfu
+
 WS2812_DRIVER = pwm
 SERIAL_DRIVER = usart
 AUDIO_ENABLE = no