Migrate MCU and BOOTLOADER to data-driven (#19529)

keyboards/yeehaw/info.json

@@ -8,6 +8,8 @@
     "pid": "0x5458",
     "device_version": "1.0.0"
   },
+  "processor": "atmega32u4",
+  "bootloader": "caterina",
   "layouts": {
       "LAYOUT": {
           "layout": [{"label":"VOLU", "x":1, "y":0}, {"label":"VOLD", "x":1, "y":1}, {"label":"M1", "x":2, "y":1.5}, {"label":"UP", "x":3, "y":1.5}, {"label":"MNXT", "x":1, "y":2}, {"label":"M2", "x":4, "y":2}, {"label":"LEFT", "x":2, "y":2.5}, {"label":"DOWN", "x":3, "y":2.5}, {"label":"MO(1)", "x":0, "y":2.75}, {"label":"MPRV", "x":1, "y":3}, {"label":"RIGHT", "x":4, "y":3}, {"label":"MPLY", "x":2, "y":3.5}, {"label":"CTL S", "x":3, "y":3.5}, {"label":"RGB TOG", "x":2.5, "y":4.5}]

keyboards/yeehaw/rules.mk

@@ -1,9 +1,3 @@
-# MCU name
-MCU = atmega32u4
-
-# Bootloader selection
-BOOTLOADER = caterina
-
 # Build Options
 #   change yes to no to disable
 #