drm/i915/intel_dvo: Drop call to intel_panel_fixed_mode() from compute_config

drm/i915/intel_dvo: Drop call to intel_panel_fixed_mode() from compute_config

The function intel_dvo_compute_config() calls intel_panel_fixed_mode() only
to check if there is a valid fixed_mode and based on that it then calls
intel_panel_compute_config().

However, since the intel_panel_compute_config() already checks for
fixed_mode and we can drop the call to intel_panel_fixed_mode().

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260430131220.3891497-4-ankit.k.nautiyal@intel.com