tests/kms_frontbuffer_tracking: Including DRRS test coverage

Dynamic Refresh Rate Switch(DRRS) is used to switch the panel's
refresh rate to the lowest vrefresh supported by panel, when frame is
not flipped for more than a Sec.

In kernel, DRRS uses the front buffer tracking infrastructure.
Hence DRRS test coverage is added along with other frontbuffer tracking
based features such as FBC and PSR tests.

Here, we are testing DRRS with other features in all possible
combinations, in all required test cases, to capture any possible
regression.

v2: Addressed the comments and suggestions from Vlad, Marius.
    The signoff details from the earlier work are also included.

v3: Modified vblank rate calculation by using reply-sequence,
    provided by drmWaitVBlank, as suggested by Chris Wilson.

v4: As suggested from Chris Wilson and Daniel Vetter
    1) Avoided using pthread for calculating vblank refresh rate,
       instead used drmWaitVBlank reply sequence.
    2) Avoided using kernel-specific info like transitional delays,
       instead polling mechanism with timeout is used.
    3) Included edp-DRRS as a subtest in kms_frontbuffer_tracking.c,
       instead of having a separate test.

v5: This patch adds DRRS as a new feature in the
    kms_frontbuffer_tracking IGT.
    DRRS switch to lower vrefresh rate is tested at slow-draw subtest.

    Note:
    1) Currently kernel doesn't have support to enable and disable
       the DRRS feature dynamically(as in case of PSR). Hence if the
       panel supports DRRS it will be enabled by default.

    This is in continuation of last patch
	"https://patchwork.freedesktop.org/patch/162726/"

v6: This patch adds runtime enable and disable feature for testing DRRS

v7: This patch adds runtime enable and disable feature for testing DRRS
    through debugfs entry "i915_drrs_ctl".

v8: Commit message is updated to reflect current implementation.

v9: Addressed Paulo Zanoni comments.
    Check for DRRS_LOW at tests with OFFSCREEN + FBS_INDIVIDUAL.

v10: Corrected DRRS state expectation in suspend related subtests.

v11: Removing the global flag is_psr_drrs_combo [Rodrigo].

v12: Rewriting the DRRS inactive deduction [Rodrigo].

v13: En/Dis-able DRRS only when DRRS is capable on the setup.

v14: Handle the error states of drrs_enable only [Rodrigo].

v15: Resolved compiler warning and rebased.

Signed-off-by: Lohith BS <lohith.bs@intel.com>
Signed-off-by: aknautiy <ankit.k.nautiyal@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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