drm/i915: Add helpers to select correct ccs/aux planes

Using helpers instead of open coding this to select a CCS plane for a
main plane makes the code cleaner and less error-prone when the location
of CCS plane can be different based on the format (packed vs. YUV
semiplanar). The same applies to selecting an AUX plane which can be a
UV plane (for an uncompressed YUV semiplanar format), or a CCS plane.

Cc: Dhinakaran Pandiyan <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Mika Kahola <[email protected]>
Cc: Matt Roper <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Reviewed-by: Mika Kahola <[email protected]>
Reviewed-by: Matt Roper <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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