hwdef: added no_bootloader_DFU.inc

Author: tridge

libraries/AP_HAL_ChibiOS/hwdef/include/no_bootloader_DFU.inc

@@ -0,0 +1,7 @@
+
+# on boards with a DFU button that are low on flash we can omit the
+# bootloader from ROMFS, saving about 11k of flash. The user can still
+# update using the apj and mission planner, but if they want to update
+# the bootloader they need to use DFU with the 'xxx_with_bl.hex'
+# firmware image
+define AP_BOOTLOADER_FLASHING_ENABLED 0