[S] Change in coreboot[main]: arch/x86/cpu: Add helper function to compute cache

[Naresh Solanki (Code Review)]

Attention is currently required from: Andy Ebrahiem, Angel Pons, Felix Held, Jincheng Li, Jérémy Compostella, Maximilian Brune, Patrick Rudolph, Shuo Liu.

Naresh Solanki has posted comments on this change by Naresh Solanki. ( https://review.coreboot.org/c/coreboot/+/85638?usp=email )

Change subject: arch/x86/cpu: Add helper function to compute cache
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Patch Set 7:

(1 comment)

File src/arch/x86/cpu_common.c:

https://review.coreboot.org/c/coreboot/+/85638/comment/f79c8b50_32919613?usp... :
PS7, Line 215: bool __weak soc_fill_cpu_cache_info(uint8_t level, struct cpu_cache_info *info)
> hmm, i wonder if it would be better to have a kconfig option to replace the common implementation by […]

I wrote it in this because I felt it is easy for various SoC vendors to easily chip in custom handler. But I'm aligned with whatever best that works for our coreboot community.

Sure thing that I can add a Kconfig(say CONFIG_SOC_FILL_CPU_CACHE_INFO).

I guess you meant something like:
```
bool fill_cpu_cache_info(uint8_t level, struct cpu_cache_info *info)
{
    if (!info)
    	return false;

if (CONFIG(SOC_FILL_CPU_CACHE_INFO))
    	return soc_fill_cpu_cache_info(level, info);
    else
    	return x86_get_cpu_cache_info(level, info);
}
```
Let me know if above way works. I'll align the follow-up patch accordingly.