[S] Change in coreboot[main]: commonlib: Add skip_atoi()

[Julius Werner (Code Review)]

Attention is currently required from: Maximilian Brune.

Julius Werner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78026?usp=email )

Change subject: commonlib: Add skip_atoi()
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Patch Set 3:

(2 comments)

Patchset:

PS1:
> Its been a while, but I guess that this is what you had in mind?

When I said "move into commonlib" I meant commonlib/bsd, so that you can actually share it with libpayload (unless you want to hide this behind CONFIG_GPL... but for a small utility function like this that seems silly).

Again, I'm not a lawyer but I would still recommend at least reimplementing this with new code to lower the chance of relicensing concerns, e.g. how about this:
```
unsigned int skip_atoi(char **ptr)
{
  unsigned int result = 0;

for (char *str = *ptr; isdigit(str[0]); str++)
    result = result * 10 + (str[0] - '0');

*ptr = str;
}
```

File src/commonlib/string.c:

https://review.coreboot.org/c/coreboot/+/78026/comment/cb4d7e71_e2321fe7 :
PS3, Line 2: 
Needs to include `<ctype.h>` for `isdigit()`. (You could also move all of ctype into commonlib if you want. There's a libpayload version there so licensing shouldn't be an issue. Although I think making them static inlines like coreboot does makes more sense.)