drm/msm/dpu: rename average bandwidth-related debugfs files

Rename the debugfs files to match their purpose and the patter provided
by other bandwidth and clock-related files:

threshold_high -> max_core_ab
threshold_low -> low_core_ab

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/636069/
Link: https://lore.kernel.org/r/20250209-dpu-perf-rework-v5-6-87e936cf3004@linaro.org

Author: lumag

drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c

@@ -464,9 +464,9 @@ int dpu_core_perf_debugfs_init(struct dpu_kms *dpu_kms, struct dentry *parent)
 			&perf->core_clk_rate);
 	debugfs_create_u32("enable_bw_release", 0600, entry,
 			(u32 *)&perf->enable_bw_release);
-	debugfs_create_u32("threshold_low", 0400, entry,
+	debugfs_create_u32("low_core_ab", 0400, entry,
 			(u32 *)&perf->perf_cfg->max_bw_low);
-	debugfs_create_u32("threshold_high", 0400, entry,
+	debugfs_create_u32("max_core_ab", 0400, entry,
 			(u32 *)&perf->perf_cfg->max_bw_high);
 	debugfs_create_u32("min_core_ib", 0400, entry,
 			(u32 *)&perf->perf_cfg->min_core_ib);