build: add LINT_CPP_FILES to checkimports check

This commit adds the prerequisites which contains all the files to lint.
Currently the only the files in 'src' will be checked.

PR-URL: #33697
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Makefile

@@ -1328,7 +1328,7 @@ lint-cpp: tools/.cpplintstamp
 tools/.cpplintstamp: $(LINT_CPP_FILES)
 	@echo "Running C++ linter..."
 	@$(PYTHON) tools/cpplint.py $(CPPLINT_QUIET) $?
-	@$(PYTHON) tools/checkimports.py
+	@$(PYTHON) tools/checkimports.py $?
 	@touch $@
 
 .PHONY: lint-addon-docs