drm/i915/icl: Implement half float formats

64 bpp half float formats are supported on hdr planes only and are subject
to the following restrictions:
  * 90/270 rotation not supported
  * Yf Tiling not supported
  * Frame Buffer Compression not supported
  * Color Keying not supported

v2:
- Drop handling pixel normalize register
- Don't use icl_is_hdr_plane too early

v3:
- Use refactored icl_is_hdr_plane (Ville)
- Use u32 instead of uint32_t (Ville)

v6:
- Rebase and fix merge conflicts
- Reorganize switch statements to keep RGB grouped separately from YUV

Cc: Uma Shankar <[email protected]>
Cc: Shashank Sharma <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: [email protected]
Signed-off-by: Kevin Strasser <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Reviewed-by: Adam Jackson <[email protected]>
Acked-by: Jani Nikula <[email protected]>
Signed-off-by: Maarten Lankhorst <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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