[coreboot-gerrit] Change in coreboot[master]: Kconfig,Makefile.inc: Add support for link time optimization

[Paul Menzel (Code Review)]

Attention is currently required from: Jacob Garber.
Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/38989 )

Change subject: Kconfig,Makefile.inc: Add support for link time optimization
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Patch Set 13:

(1 comment)

Patchset:

PS13: 
ramstage is now 2 MB in size.

```
    CBFS       fallback/romstage
E: Input file size (2135728) greater than page size (261632).
E: 'fallback/romstage' can't fit in CBFS for page-size 0, align 0x40.
E: Failed while operating on 'COREBOOT' region!
E: The image will be left unmodified.
make[1]: *** [Makefile.inc:1101: /cb-build/coreboot-gerrit.0/default/EMULATION_QEMU_X86_I440FX_X86_64/coreboot.pre] Error 1
make[1]: Leaving directory '/home/coreboot/node-root/workspace/coreboot-gerrit'
```