x86/lib: Add CPUID(0x1) family and model calculation

The x86 library provides x86_family() and x86_model().  They take raw
CPUID register output and calculate the CPU family and model from it.

In follow-up work, the x86 subsystem will use APIs which access
previously-parsed CPUID leafs structure instead of doing direct CPUID queries.
These new APIs force using the auto generated leaf data types at
<asm/cpuid/leaf_types.h>.

Introduce x86 family and model calculation functions that take these
auto-generated data types.  Refactor the original code so that no logic is
duplicated.

  [ bp: Massage commit message, unbreak too long line. ]

Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260528153923.403473-11-darwi@linutronix.de

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