x86/cacheinfo: Consolidate AMD/Hygon leaf 0x8000001d calls

While gathering CPU cache info, CPUID leaf 0x8000001d is invoked in two
separate if blocks: one for Hygon CPUs and one for AMDs with topology
extensions.  After each invocation, amd_init_l3_cache() is called.

Merge the two if blocks into a single condition, thus removing the
duplicated code.  Future commits will expand these if blocks, so
combining them now is both cleaner and more maintainable.

Note, while at it, remove a useless "better error?" comment that was
within the same function since the 2005 commit e2cac78935ff ("[PATCH]
x86_64: When running cpuid4 need to run on the correct CPU").

Note, as previously done at commit aec28d852ed2 ("x86/cpuid: Standardize
on u32 in <asm/cpuid/api.h>"), standardize on using 'u32' and 'u8' types.

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/20250324133324.23458-12-darwi@linutronix.de

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