perf spark: Fix includes and add SPDX
scnprintf is declared in linux/kernel.h, directly depend upon it.
Add missing SPDX comments.
Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250710235126.1086011-4-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
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