x86/cpuid: Introduce <asm/cpuid/leaf_types.h>

x86/cpuid: Introduce <asm/cpuid/leaf_types.h>

To centralize all CPUID access across the x86 subsystem, introduce
<asm/cpuid/leaf_types.h>.  It is generated by the x86-cpuid-db project¹ and
provides C99 bitfield listings for all publicly known CPUID leaves.

¹ https://gitlab.com/x86-cpuid.org/x86-cpuid-db/-/blob/v3.0/CHANGELOG.rst

Suggested-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20260327021645.555257-1-darwi@linutronix.de