Miscellaneous rules.mk cleanups (#7212)

* Miscellaneous rules.mk cleanups

* Put back ARM bootloader rules

keyboards/converter/usb_usb/ble/rules.mk

@@ -1,5 +1,4 @@
-BLUETOOTH = AdafruitBLE
+# Processor frequency
-ADAFRUIT_BLE_ENABLE = yes
 F_CPU = 8000000
 
 BOOTMAGIC_ENABLE = no      # Virtual DIP switch configuration(+1000)
@@ -19,5 +18,7 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 AUDIO_ENABLE = no           # Audio output on port C6
 FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
 HD44780_ENABLE = no 		# Enable support for HD44780 based LCDs (+400)
+BLUETOOTH = AdafruitBLE
+ADAFRUIT_BLE_ENABLE = yes
 
 EXTRAFLAGS += -flto

keyboards/converter/usb_usb/hasu/rules.mk

@@ -1 +1,2 @@
+# Processor frequency
 F_CPU = 16000000

keyboards/converter/usb_usb/pro_micro/rules.mk

@@ -1 +1,2 @@
+# Processor frequency
 F_CPU = 8000000

keyboards/handwired/42/rules.mk

@@ -1,7 +1,7 @@
 # MCU name
 MCU = atmega32u4
 
-# Processor frequency.
+# Processor frequency
 F_CPU = 8000000
 
 # Bootloader selection

keyboards/handwired/chiron/rules.mk

@@ -10,7 +10,6 @@ MCU = atmega32u4
 #   ATmega32A    bootloadHID
 #   ATmega328P   USBasp
 BOOTLOADER = atmel-dfu
-SPLIT_KEYBOARD = yes
 
 # Build Options
 #   change yes to no to disable
@@ -36,3 +35,4 @@ TAP_DANCE_ENABLE = no
 UCIS_ENABLE = no
 UNICODEMAP_ENABLE = no
 UNICODE_ENABLE = no
+SPLIT_KEYBOARD = yes

keyboards/handwired/fruity60/rules.mk

@@ -1,6 +1,9 @@
 # MCU name
 MCU = atmega32u4
 
+# Processor frequency
+F_CPU = 8000000
+
 # Bootloader selection
 #   Teensy       halfkay
 #   Pro Micro    caterina
@@ -11,9 +14,6 @@ MCU = atmega32u4
 #   ATmega328P   USBasp
 BOOTLOADER = caterina
 
-# Processor frequency
-F_CPU = 8000000
-
 # Build Options
 #   change yes to no to disable
 #

keyboards/kbdfans/kbd67/mkii_soldered/rules.mk

@@ -1,7 +1,6 @@
 # MCU name
 MCU = atmega32u4
 
-
 # Bootloader selection
 #   Teensy       halfkay
 #   Pro Micro    caterina
@@ -12,7 +11,6 @@ MCU = atmega32u4
 #   ATmega328P   USBasp
 BOOTLOADER = atmel-dfu
 
-
 # Build Options
 #   change yes to no to disable
 #