[S] Change in coreboot[master]: cpu/x86: Set up cpu_info storage using MSR

[Raul Rangel (Code Review)]

Attention is currently required from: Arthur Heymans.

Raul Rangel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/68913 )

Change subject: cpu/x86: Set up cpu_info storage using MSR
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Patch Set 5:

(2 comments)

File src/arch/x86/include/arch/cpu.h:

https://review.coreboot.org/c/coreboot/+/68913/comment/74acc404_ac278795 
PS5, Line 156: (cpuid_edx(0x80000001) & (1 << 29)) != 0;
Make this a helper method so you don't need to duplicate it.

https://review.coreboot.org/c/coreboot/+/68913/comment/10fd8e5a_8e936b1e 
PS5, Line 159: 		msr_t msr = rdmsr(IA32_GS_BASE);
             : 		ci = (struct cpu_info *)(uintptr_t)msr.raw;
             : 		return ci;
```
struct per_cpu_segment_data *segment_data = (struct per_cpu_segment_data *)(uintptr_t)msr.raw;
return segment_data->cpu_info.
```