Merge pull request #8248 from neiljay/pr/mips_makefile_improvements

mips: clean up pic32 makefiles

cpu/mips_pic32_common/Makefile.include

+include $(RIOTCPU)/mips32r2_common/Makefile.include
+
 export INCLUDES += -I$(RIOTCPU)/mips_pic32_common/include
 
 USEMODULE += mips_pic32_common

cpu/mips_pic32mx/Makefile.features

 -include $(RIOTCPU)/mips_pic32_common/Makefile.features
--include $(RIOTCPU)/mips32r2_common/Makefile.features

cpu/mips_pic32mx/Makefile.include

 export ROMABLE = 1
 
-include $(RIOTMAKE)/arch/mips.inc.mk
 include $(RIOTCPU)/mips_pic32_common/Makefile.include
-include $(RIOTCPU)/mips32r2_common/Makefile.include
+include $(RIOTMAKE)/arch/mips.inc.mk
 
 # define build specific options
 export CFLAGS += -march=m4k -DSKIP_COPY_TO_RAM

cpu/mips_pic32mz/Makefile.features

 FEATURES_PROVIDED += periph_hwrng
 
 -include $(RIOTCPU)/mips_pic32_common/Makefile.features
--include $(RIOTCPU)/mips32r2_common/Makefile.features

cpu/mips_pic32mz/Makefile.include

 export ROMABLE = 1
 
-include $(RIOTMAKE)/arch/mips.inc.mk
 include $(RIOTCPU)/mips_pic32_common/Makefile.include
-include $(RIOTCPU)/mips32r2_common/Makefile.include
+include $(RIOTMAKE)/arch/mips.inc.mk
 
 # define build specific options
 export CFLAGS += -march=m5101 -mmicromips -DSKIP_COPY_TO_RAM