lunch for Udoo Neo: Don't have a product spec for: 'udooneo_6sx'

[namchuai]

Well, I think that this project has been abandoned. Anyway, I will just put the issue here for someone out there who might looking for an answer.

Happen on Ubuntu 18.04, latest source (I just synced everything by today 2019/08/03)
Issue:
$ lunch udooneo_6sx-eng
device/udoo/udooneo_6sx/BoardConfig.mk:118: *** recipe commences before first target. Stop.

** Don't have a product spec for: 'udooneo_6sx'
** Do you have the right repo manifest?

Fix:

1. $ vi device/udoo/udooneo_6sx/BoardConfig.mk
2. Go to line 118, which is device/udoo/udooneo_6sx/udoo-gpio-export:system/bin/udoo-gpio-export
3. Replace tab with space with that line
4. $ croot
5. lunch udooneo_6sx-eng

Now udooneo_6sx is selected.