drm/i915/fec: Set FEC_READY in FEC_CONFIGURATION

If the panel supports FEC, the driver has to
set the FEC_READY bit in the dpcd register:
FEC_CONFIGURATION.

This has to happen before link training.

v2: s/intel_dp_set_fec_ready/intel_dp_sink_set_fec_ready
   - change commit message. (Gaurav)

v3: rebased. (r-b Manasi)

v4: Use fec crtc state, before setting FEC_READY
bit. (Anusha)

v5: Move to intel_ddi.c
- Make the function static (Anusha)

v6: Dont pass state as a separate argument (Ville)

v7: (From Manasi)
* Correct the debug print (Ville)

Cc: [email protected]
Cc: Gaurav K Singh <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Ville Syrjala <[email protected]>
Cc: Manasi Navare <[email protected]>
Signed-off-by: Anusha Srivatsa <[email protected]>
Signed-off-by: Manasi Navare <[email protected]>
Reviewed-by: Manasi Navare <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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