Merge pull request #6599 from smlng/pr/tests/fix_default_board_calliope_mini

tests: fix default board for tests

tests/Makefile.tests_common

+ifneq (,$(filter driver_%,$(APPLICATION)))
+    BOARD ?= samr21-xpro
+endif
 BOARD ?= native
 RIOTBASE ?= $(CURDIR)/../..
 QUIET ?= 1

tests/board_calliope-mini/Makefile

 APPLICATION = board_calliope-mini
-include ../Makefile.tests_common
-
 BOARD ?= calliope-mini
+include ../Makefile.tests_common
 
 # This test application is for the Calliope mini only
 BOARD_WHITELIST := calliope-mini

tests/driver_lis3mdl/Makefile

 APPLICATION = driver_lis3mdl
+BOARD ?= limifrog-v1
 include ../Makefile.tests_common
 
 # only this board is known (yet) to provide the sensor LIS3MDL

tests/mpu_stack_guard/Makefile

 APPLICATION = mpu_stack_guard
+BOARD ?= samr21-xpro
 include ../Makefile.tests_common
 
 BOARD_WHITELIST += arduino-due      # cortex-m3

tests/periph_adc/Makefile

 APPLICATION = periph_adc
+BOARD ?= pba-d-01-kw2x
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_adc

tests/periph_dac/Makefile

 APPLICATION = periph_dac
+BOARD ?= stm32f4discovery
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_dac

tests/periph_flashpage/Makefile

 APPLICATION = periph_flashpage
+BOARD ?= iotlab-m3
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_flashpage

tests/periph_i2c/Makefile

 APPLICATION = periph_i2c
+BOARD ?= samr21-xpro
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_i2c

tests/periph_pwm/Makefile

 APPLICATION = periph_pwm
+BOARD ?= samr21-xpro
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_pwm

tests/periph_rtt/Makefile

 APPLICATION = periph_rtt
+BOARD ?= samr21-xpro
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_rtt

tests/periph_spi/Makefile

 APPLICATION = periph_spi
+BOARD ?= samr21-xpro
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_spi

tests/pkg_cmsis-dsp/Makefile

 APPLICATION = cmsis-dsp
+BOARD ?= samr21-xpro
 include ../Makefile.tests_common
 
 USEPKG += cmsis-dsp

tests/warn_conflict/Makefile

 APPLICATION = warn_conflict
+BOARD ?= stm32f4discovery
 include ../Makefile.tests_common
 
 # The stm32f4discovery is the only board that provides known conflicting features,