Merge pull request #5233 from gebart/pr/nucleo-f072-makefile

boards/nucleo-f072: Use common serial and openocd defines

boards/nucleo-f072/Makefile.include

@@ -2,14 +2,5 @@
 export CPU = stm32f0
 export CPU_MODEL = stm32f072rb
 
-#define the default port depending on the host OS
-PORT_LINUX ?= /dev/ttyACM0
-PORT_DARWIN ?= $(shell ls -1 /dev/tty.usbmodem* | head -n 1)
-
-# setup serial terminal
-include $(RIOTBOARD)/Makefile.include.serial
-
-# this board uses openocd
-include $(RIOTBOARD)/Makefile.include.openocd
-
+# load the common Makefile.include for Nucleo boards
 include $(RIOTBOARD)/nucleo-common/Makefile.include