Split out scripts/code.py into scripts/code.py and scripts/data.py

This is to avoid unexpected script behavior even though data.py should
always return 0 bytes for littlefs. Maybe a check for this should be
added to CI?

Makefile

@@ -44,6 +44,7 @@ override CFLAGS += -Wextra -Wshadow -Wjump-misses-init -Wundef
 ifdef VERBOSE
 override TESTFLAGS += -v
 override CODEFLAGS += -v
+override DATAFLAGS += -v
 override COVERAGEFLAGS += -v
 endif
 ifdef EXEC
@@ -52,9 +53,11 @@ endif
 ifdef BUILDDIR
 override TESTFLAGS += --build-dir="$(BUILDDIR:/=)"
 override CODEFLAGS += --build-dir="$(BUILDDIR:/=)"
+override DATAFLAGS += --build-dir="$(BUILDDIR:/=)"
 endif
 ifneq ($(NM),nm)
 override CODEFLAGS += --nm-tool="$(NM)"
+override DATAFLAGS += --nm-tool="$(NM)"
 endif
 
 
@@ -77,6 +80,10 @@ tags:
 code: $(OBJ)
 	./scripts/code.py -S $^ $(CODEFLAGS)
 
+.PHONY: data
+data: $(OBJ)
+	./scripts/data.py -S $^ $(DATAFLAGS)
+
 .PHONY: test
 test:
 	./scripts/test.py $(TESTFLAGS)