Change in coreboot[master]: tests: enable code coverage for unit tests

[Paul Fagerburg (Code Review)]

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

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

https://review.coreboot.org/c/coreboot/+/52444

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

Change subject: tests: enable code coverage for unit tests
......................................................................

tests: enable code coverage for unit tests

Add a new `coverage-unit-tests` make target that builds the unit
tests for code coverage, runs the tests, and generates a coverage
report.

Signed-off-by: Paul Fagerburg 
Change-Id: I6ea780ee9e246c0bb8c35b8e0de4252431dabbff
---
M tests/Makefile.inc
1 file changed, 15 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/44/52444/3