Change in coreboot[master]: xcompile,clang: increase the number of bracket-depth for CPP

[Arthur Heymans (Code Review)]

Attention is currently required from: Arthur Heymans, Martin L Roth.
Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62175 )

Change subject: xcompile,clang: increase the number of bracket-depth for CPP
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Patch Set 1:

(1 comment)

File util/xcompile/xcompile:

https://review.coreboot.org/c/coreboot/+/62175/comment/76cd6b75_6c703f73 
PS1, Line 241: 2048
> While I get the idea of "let's just fix this so it never happens again", maybe we should change to 512 or so first?  I mean even exceeding 256 levels of nested brackets seems like it might be a sign that something should be rewritten.  Going straight to 2048 seems excessive.
>
> According to the patch that introduced this option, it has an effect on stack usage, presumably just by changing the option.
> https://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20130218/074645.htm...

GPIO configuration on Intel platforms seems to use a ton of nested brackets with macros. 512 & 1024 was not enough so I bumped it to 2048.