Add a universal flash command for cli (#6224)

* Add universal flash command

* Add bootloader info to I:C boards

* Add support for ATSAM

* Add messages for flash target

* Message cleanup

* Add USB ASP Flashing target

* Make usbasp target more universal

* Add phoney target for usbasp

* Clarify error message when bootloader isn't matched

keyboards/ergodox_infinity/keymaps/halfkeyboard/rules.mk

@@ -54,6 +54,8 @@ ARMV = 7
 # The CORTEX_VTOR... is needed only for MCHCK/Infinity KB
 OPT_DEFS += -DCORTEX_VTOR_INIT=0x00002000
 
+BOOTLOADER = dfu
+
 # Build Options
 #   comment out to disable the options.
 #

keyboards/ergodox_infinity/rules.mk

@@ -54,6 +54,8 @@ ARMV = 7
 # The CORTEX_VTOR... is needed only for MCHCK/Infinity KB
 OPT_DEFS += -DCORTEX_VTOR_INIT=0x00002000
 
+BOOTLOADER = dfu
+
 # Build Options
 #   comment out to disable the options.
 #