Change in coreboot[master]: selfboot: Add support for selfload in romstage

[Shelley Chen (Code Review)]

Attention is currently required from: Ravi kumar, Paul Menzel, mturney mturney.
Shelley Chen has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55865 )

Change subject: selfboot: Add support for selfload in romstage
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Patch Set 5:

(4 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/55865/comment/9a354ee5_c37f3322 
PS4, Line 7: selfboot:  Add
> Please use exactly one space after the colon.

Done

https://review.coreboot.org/c/coreboot/+/55865/comment/43ef597e_ca82fba9 
PS4, Line 11:
> Please paste one example linker error.

This is the error.  I don't think that this needs to be in the commit message:

LINK       cbfs/fallback/romstage.debug
/opt/coreboot-sdk/bin/aarch64-elf-ld.bfd: /build/herobrine/tmp/portage/sys-boot/coreboot-9999/work/build/herobrine/romstage/lib/selfboot.o: in function `segment_targets_type':
/build/herobrine/tmp/portage/sys-boot/coreboot-9999/work/coreboot-9999/src/lib/selfboot.c:38: undefined reference to `bootmem_region_targets_type'
/build/herobrine/tmp/portage/sys-boot/coreboot-9999/work/coreboot-9999/src/lib/selfboot.c:38:(.text.selfload_mapped+0x78): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `bootmem_region_targets_type'
/opt/coreboot-sdk/bin/aarch64-elf-ld.bfd: /build/herobrine/tmp/portage/sys-boot/coreboot-9999/work/coreboot-9999/src/lib/selfboot.c:45: undefined reference to `bootmem_dump_ranges'
/build/herobrine/tmp/portage/sys-boot/coreboot-9999/work/coreboot-9999/src/lib/selfboot.c:45:(.text.selfload_mapped+0xa8): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `bootmem_dump_ranges'
make: *** [src/arch/arm64/Makefile.inc:99: /build/herobrine/tmp/portage/sys-boot/coreboot-9999/work/build/herobrine/cbfs/fallback/romstage.debug] Error 1

https://review.coreboot.org/c/coreboot/+/55865/comment/d24d54c0_a8670e5a 
PS4, Line 12: BUG=None
> Don’t all Chromium related things need a bug entry?

Not necessarily.  Sometimes cleanup issues or simple compilation fixes can be done w/o creating a bug.

https://review.coreboot.org/c/coreboot/+/55865/comment/2044f5fe_a2d0f2dc 
PS4, Line 15: can compile
            :      successfully.
> successful compilation

Done