perf vendor events arm64: imx95: add imx95_bandwidth_usage.lpddr4x metric

Except lpddr5, i.MX95 also support lpddr4x. This will add a metric for
lpddr4x.

Signed-off-by: Xu Yang <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/pmu-events/arch/arm64/freescale/imx95/sys/metrics.json

···
 		"Compat": "imx95"
 	},
 	{
+		"BriefDescription": "bandwidth usage for lpddr4x evk board",
+		"MetricName": "imx95_bandwidth_usage.lpddr4x",
+		"MetricExpr": "(( imx9_ddr0@eddrtq_pm_rd_beat_filt0\\,axi_mask\\=0x000\\,axi_id\\=0x000@ + imx9_ddr0@eddrtq_pm_wr_beat_filt\\,axi_mask\\=0x000\\,axi_id\\=0x000@ ) * 32 / duration_time) / (4000 * 1000000 * 4)",
+		"ScaleUnit": "1e2%",
+		"Unit": "imx9_ddr",
+		"Compat": "imx95"
+	},
+	{
 		"BriefDescription": "bytes of all masters read from ddr",
 		"MetricName": "imx95_ddr_read.all",
 		"MetricExpr": "( imx9_ddr0@eddrtq_pm_rd_beat_filt0\\,axi_mask\\=0x000\\,axi_id\\=0x000@ ) * 32",