Change in coreboot[master]: payloads/external/Linuxboot: support u-root versions

[Jens Drenhaus (Code Review)]

Hello Patrick Rudolph, Marcello Sylvester Bauer, Philipp Deppenwiese, build bot (Jenkins),

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

https://review.coreboot.org/29516

to look at the new patch set (#4).

Change subject: payloads/external/Linuxboot: support u-root versions
......................................................................

payloads/external/Linuxboot: support u-root versions

Since u-root uses release tags on github, now these releases can be
checked out in u-root.mk. A specific release can be selected in the Kbuild
system when u-root is set in Linuxboot payload. The default vlalue is
v2.0.0.

Change-Id: I65e1ccf0319809f7fab23142b31882e9928a5ec2
Signed-off-by: Jens Drenhaus 
---
M payloads/external/LinuxBoot/Kconfig
M payloads/external/LinuxBoot/targets/u-root.mk
2 files changed, 21 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/16/29516/4