drm/edid: Abstract away cea_edid_modes[]

We're going to need two cea mode tables (one for VICs < 128,
another one for VICs >= 193). To that end replace the direct
edid_cea_modes[] lookups with a function call. And we'll rename
the array to edid_cea_modes_0[] to indicate how it's to be
indexed.

v2: Fix typos (Tom)
    Drop the pointless NULL checks in the loops (Tom)
    Assign when declaring (Tom)
    Improve the comment for cea_modes_*[] to indicate
    that one should always use cea_mode_for_vic() (Tom)

Cc: Tom Anderson <[email protected]>
Cc: Hans Verkuil <[email protected]>
Cc: Manasi Navare <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Thomas Anderson <[email protected]>

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