x86/cacheinfo: Remove the P4 trace leftovers for real

Commit 851026a2 ("x86/cacheinfo: Remove unused trace variable") removed
the switch case for LVL_TRACE but did not get rid of the surrounding gunk.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250304085152.51092-12-darwi@linutronix.de