tests: add kms_frontbuffer_tracking

This is a new test that should exercise the frontbuffer tracking
feature of the Kernel in a number of different ways. We use different
drawing methods, we use the primary, cursor and sprite planes, we can
test both on single and dual pipes, also on buffers not associated
with any CRTCs, etc.

We currently have assertions for both FBC and PSR, and we also have a
"nop" test mode that should disable both FBC and PSR, and can be
used for debugging.

This test is also capable of testing both FBC and PSR even if they are
disabled by default on the Kernel: the test knows how to change the
i915.ko parameters and then set them back after testing.

I am getting a significant number of failures when I run this test,
which means we have some work to do on the Kernel.

I also still have a small list of additional subtests that I plan to
add to this test, and those tests are documented on the main function.

v2:
 - Use igt_debugfs_open() (Thomas).
 - Use igt_test_description() (Thomas).
 - Don't check drm_open_any_master()'s result (Thomas).
 - Use igt_require_f() in some cases (Thomas).
 - Standardize some assertions.
 - Use the new module param functions.
 - Check if FBC is supported by the chipset.
 - Add new subtests (multidraw, enum fbs, fbc+psr).
 - Make tests a little shorter.
 - Reorganize which tests ara ran by default.
 - Better comments everywhere.
 - Rebase.

v3:
 - Fix a small typo.
 - Improve the log messages a little bit more.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

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