drm/dp_mst: Add kunit tests for drm_dp_get_vc_payload_bw()

Add kunit test cases for drm_dp_get_vc_payload_bw() with all the DP1.4
and UHBR link configurations.

v2:
- List test cases in decreasing rate,lane count order matching the
  corresponding DP Standard tables. (Ville)
- Add references to the DP Standard tables.
v3:
- Sort the testcases properly.
v4:
- Avoid 'stack frame size x exceeds limit y in
  drm_test_dp_mst_calc_pbn_div()' compiler warn. (LKP)

Cc: Ville Syrjälä <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: [email protected]
Cc: kernel test robot <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Acked-by: Maarten Lankhorst <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]> (v3)
Signed-off-by: Imre Deak <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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