Change in coreboot[master]: payloads/external: add skiboot (for QEMU/Power9)

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Martin Roth, Igor Bagnucki, Stefan Reinauer, Krystian Hebel, Timothy Pearson.
Hello build bot (Jenkins), Martin Roth, Igor Bagnucki, Stefan Reinauer, Krystian Hebel, Timothy Pearson,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/58656

to look at the new patch set (#11).

Change subject: payloads/external: add skiboot (for QEMU/Power9)
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payloads/external: add skiboot (for QEMU/Power9)

Add an option to build skiboot as a payload. This makes QEMU Power9
board simpler to use as skiboot is necessary anyway.

Change-Id: I0b49ea7464c97cc2ff0d5030629deed549851372
Signed-off-by: Igor Bagnucki 
Signed-off-by: Krystian Hebel 
Signed-off-by: Sergii Dmytruk 
---
M Documentation/mainboard/emulation/qemu-power9.md
M payloads/Makefile.inc
M payloads/external/.gitignore
M payloads/external/Makefile.inc
A payloads/external/skiboot/Kconfig
A payloads/external/skiboot/Kconfig.name
A payloads/external/skiboot/Makefile
M src/mainboard/emulation/qemu-power9/Kconfig
8 files changed, 105 insertions(+), 8 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/56/58656/11