x86/cacheinfo: Use CPUID leaf 0x2 parsing helpers

x86/cacheinfo: Use CPUID leaf 0x2 parsing helpers

Parent commit introduced CPUID leaf 0x2 parsing helpers at
<asm/cpuid/leaf_0x2_api.h>.  The new API allows sharing leaf 0x2's output
validation and iteration logic across both intel.c and cacheinfo.c.

Convert cacheinfo.c to that new API.

Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250324133324.23458-5-darwi@linutronix.de