drm/i915/dp: Change drm_err to drm_dbg_kms

Change the drm_err to drm_dbg_kms when we fail to read the FEC
capability. This is mainly because this is called from intel_dp_detect.
Which ends up in race more frequently in case of MST scenarios,
when we are disabling streams but the downstream Dock still sends
signals which causes intel_dp_detect to be invoked which has DPCD
reads. These pass until the Transcoder and DPLL go down causing
AUX to go down too. At this point AUX Timeouts are expected and not
an issue. But this drm_err gets flagged in CI causing noise even
for passing scenarios.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patch.msgid.link/20260423080355.2744117-1-suraj.kandpal@intel.com

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