Change in coreboot[master]: Makefile: Add unit-tests help and targets list

[Jakub Czapiga (Code Review)]

Attention is currently required from: Martin Roth.
Hello build bot (Jenkins), Patrick Georgi, Martin Roth,

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

https://review.coreboot.org/c/coreboot/+/52293

to look at the new patch set (#3).

Change subject: Makefile: Add unit-tests help and targets list
......................................................................

Makefile: Add unit-tests help and targets list

Add unit-tests targets to help output. Add list-unit-tests target
that lists all available unit-tests.

Signed-off-by: Jakub Czapiga 
Change-Id: I464a76cbea1f4afbc3fc772960787952e61b95b9
---
M Makefile
M tests/Makefile.inc
2 files changed, 23 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/93/52293/3