x86/cpu: Remove CPUID leaf 0x2 parsing loop

x86/cpu: Remove CPUID leaf 0x2 parsing loop

Leaf 0x2 output includes a "query count" byte where it was supposed to
specify the number of repeated CPUID leaf 0x2 subleaf 0 queries needed to
extract all of the CPU's cache and TLB descriptors.

Per current Intel manuals, all CPUs supporting this leaf "will always"
return an iteration count of 1.

Remove the leaf 0x2 query loop and just query the hardware once.

Note, as previously done in:

  aec28d852ed2 ("x86/cpuid: Standardize on u32 in <asm/cpuid/api.h>")

standardize on using 'u32' and 'u8' types.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
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/20250324133324.23458-2-darwi@linutronix.de