tests: Add build subsystem for unit testing coreboot

Add a subsystem which will be used for writing, building and running
unit tests for different coreboot's modules. This work is built using
Cmocka unit testing framework. Description of what unit testing means
(for the author) and how unit testing framework evaluation was performed
may be found in Documentation/technotes/2020-03-unit-testing-coreboot.md

Makefiles structure is very similar to this used for building coreboot
images. Every directory has its own Makefile.inc were tests' names,
sources, subdirs and multiple other test-related attributes are defined
in form of variables.

Signed-off-by: Jan Dabros <jsd@semihalf.com>
Change-Id: I9b0220b84b9a6e448476ca3eb3ccccc5fb829ad1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39894
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

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