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

keyboards/primekb/prime_e/info.json

@@ -5,6 +5,8 @@
   "usb": {
     "vid": "0x5052"
   },
+  "processor": "atmega32u4",
+  "bootloader": "atmel-dfu",
   "layouts": {
       "LAYOUT": {
           "layout": [{"x":0,"y":0,"w":1,"h":1}, {"x":1,"y":0,"w":1,"h":1}, {"x":2,"y":0,"w":1,"h":1}, {"x":3,"y":0,"w":1,"h":1}, {"x":4,"y":0,"w":1,"h":1}, {"x":5,"y":0,"w":1,"h":1}, {"x":7,"y":0,"w":1,"h":1}, {"x":8,"y":0,"w":1,"h":1}, {"x":9,"y":0,"w":1,"h":1}, {"x":10,"y":0,"w":1,"h":1}, {"x":11,"y":0,"w":1,"h":1}, {"x":12,"y":0,"w":1,"h":1}, {"x":13,"y":0,"w":1,"h":1},

keyboards/primekb/prime_e/rules.mk

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