selftests: vDSO: vdso_test_correctness: Drop SYS_getcpu fallbacks
These fallbacks are only valid on x86 and unused in the first place.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260227-vdso-selftest-cleanups-v2-3-d84830fa8beb@linutronix.de
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