drm/i915/dp: Extend program of VSC Header and DB for Colorimetry Format

It refactors and renames a function which handled vsc sdp header and data
block setup for supporting colorimetry format.
Function intel_dp_setup_vsc_sdp handles vsc sdp header and data block
setup for pixel encoding / colorimetry format.
In order to use colorspace information of a connector, it adds an argument
of drm_connector_state type.

Setup VSC header and data block in function intel_dp_setup_vsc_sdp for
pixel encoding / colorimetry format as per dp 1.4a spec, section 2.2.5.7.1,
table 2-119: VSC SDP Header Bytes, section 2.2.5.7.5,
table 2-120: VSC SDP Payload for DB16 through DB18.

Signed-off-by: Gwan-gyeong Mun <[email protected]>
Reviewed-by: Uma Shankar <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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