drm/gamma: Clarify gamma lut uapi

Interpreting it as a 0.16 fixed point means we can't accurately
represent 1.0. Which is one of the values we really should be able to
represent.

Since most (all?) luts have lower precision this will only affect
rounding of 0xffff.

Cc: Uma Shankar <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Shashank Sharma <[email protected]>
Cc: "Kumar, Kiran S" <[email protected]>
Cc: Kausal Malladi <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Cc: Matt Roper <[email protected]>
Cc: Rob Bradford <[email protected]>
Cc: Daniel Stone <[email protected]>
Cc: Stefan Schake <[email protected]>
Cc: Eric Anholt <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Leo Li <[email protected]>
Cc: [email protected]
Cc: James (Qian) Wang <[email protected]>
Cc: Liviu Dudau <[email protected]>
Cc: Mali DP Maintainers <[email protected]>
Cc: CK Hu <[email protected]>
Cc: Philipp Zabel <[email protected]>
Cc: Yannick Fertre <[email protected]>
Cc: Philippe Cornu <[email protected]>
Cc: Benjamin Gaignard <[email protected]>
Cc: Vincent Abriou <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Cc: Boris Brezillon <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Acked-by: Liviu Dudau <[email protected]>
Acked-by: Lionel Landwerlin <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Reviewed-by: Matt Roper <[email protected]>
Reviewed-by: Philippe Cornu <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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