drm/i915/dp: Fix the max DSC bpc supported by source

Use correct helper for getting max DSC bpc supported by the source.

Fixes: 1c56e9a ("drm/i915/dp: Get optimal link config to have best compressed bpp")
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Swati Sharma <swati2.sharma@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231213091632.431557-3-ankit.k.nautiyal@intel.com
(cherry picked from commit cd7b0b2)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

Author: aknautiyal

drivers/gpu/drm/i915/display/intel_dp.c

@@ -2101,7 +2101,7 @@ static int intel_dp_dsc_compute_pipe_bpp(struct intel_dp *intel_dp,
 		}
 	}
 
-	dsc_max_bpc = intel_dp_dsc_min_src_input_bpc(i915);
+	dsc_max_bpc = intel_dp_dsc_max_src_input_bpc(i915);
 	if (!dsc_max_bpc)
 		return -EINVAL;