[S] Change in coreboot[main]: CFR: Add min/max/step values and hex display flag for number options

[Filip Brozovic (Code Review)]

Attention is currently required from: Angel Pons, Matt DeVillier, Sean Rhodes.

Filip Brozovic has posted comments on this change by Filip Brozovic. ( https://review.coreboot.org/c/coreboot/+/86039?usp=email )

Change subject: CFR: Add min/max/step values and hex display flag for number options
......................................................................

Patch Set 2:

(1 comment)

File src/commonlib/include/commonlib/cfr.h:

https://review.coreboot.org/c/coreboot/+/86039/comment/b3700201_7d65c496?usp... :
PS2, Line 139: uint32_t min;
             : 	uint32_t max;
             : 	uint32_t step;
> Yes, the CFR header is where a version number would be. […]

Should we add a fixed version number to the header in coreboot, change `lb_cfr_numeric_option` to add `min`, `max` and `step` as has been done here, and let whoever is parsing the data decide how large the struct is based on the version?