Merge pull request #10062 from cladmi/pr/make/cpu/fe310/features

 cpu/fe310: rtc depend on the rtt feature and hifive1 update

boards/hifive1/Makefile.features

@@ -7,10 +7,6 @@ FEATURES_PROVIDED += periph_rtt
 FEATURES_PROVIDED += periph_timer
 FEATURES_PROVIDED += periph_uart
 
-ifneq (,$(filter periph_rtc,$(FEATURES_REQUIRED)))
-  FEATURES_REQUIRED += periph_rtt
-endif
-
 # The board MPU family (used for grouping by the CI system)
 FEATURES_MCU_GROUP = risc_v
 

cpu/fe310/Makefile.dep

 ifneq (,$(filter periph_rtc,$(USEMODULE)))
-  USEMODULE += periph_rtt
+  FEATURES_REQUIRED += periph_rtt
 endif