drm/i915/gt: remove mem freq from gt debugfs

It's a bit out of place, and only printed for VLV/CHV.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/bbfec4c67a81d1d3de1f40484a80b7164e69df21.1718356614.git.jani.nikula@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c

@@ -367,7 +367,6 @@ void intel_gt_pm_frequency_dump(struct intel_gt *gt, struct drm_printer *p)
 		vlv_punit_put(i915);
 
 		drm_printf(p, "PUNIT_REG_GPU_FREQ_STS: 0x%08x\n", freq_sts);
-		drm_printf(p, "DDR freq: %d MHz\n", i915->mem_freq);
 
 		drm_printf(p, "actual GPU freq: %d MHz\n",
 			   intel_gpu_freq(rps, (freq_sts >> 8) & 0xff));