Merge pull request #9304 from haukepetersen/fix_servo_deps

drivers/servo: add periph_pwm as dependency

drivers/Makefile.dep

@@ -298,6 +298,10 @@ ifneq (,$(filter sdcard_spi,$(USEMODULE)))
   USEMODULE += xtimer
 endif
 
+ifneq (,$(filter servo,$(USEMODULE)))
+  FEATURES_REQUIRED += periph_pwm
+endif
+
 ifneq (,$(filter sht11,$(USEMODULE)))
   USEMODULE += xtimer
 endif

tests/driver_servo/Makefile

 include ../Makefile.tests_common
 
-FEATURES_REQUIRED = periph_pwm
-
 USEMODULE += xtimer
 USEMODULE += servo