perf vendor events arm64:: Add i.MX95 DDR Performance Monitor metrics

Add JSON metrics for i.MX95 DDR Performance Monitor.
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Cc: festevam@gmail.com
Cc: conor+dt@kernel.org
Cc: robh+dt@kernel.org
Cc: shawnguo@kernel.org
Cc: will@kernel.org
Cc: krzysztof.kozlowski+dt@linaro.org
Cc: mike.leach@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: imx@lists.linux.dev
Cc: kernel@pengutronix.de
Cc: s.hauer@pengutronix.de
Cc: devicetree@vger.kernel.org
Link: https://lore.kernel.org/r/20240529080358.703784-8-xu.yang_2@nxp.comSigned-off-by: Namhyung Kim <namhyung@kernel.org>

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

+[
+   {
+           "BriefDescription": "ddr cycles event",
+           "EventCode": "0x00",
+           "EventName": "imx95_ddr.cycles",
+           "Unit": "imx9_ddr",
+           "Compat": "imx95"
+   }
+]

tools/perf/pmu-events/jevents.py

@@ -284,6 +284,7 @@ class JsonEvent:
           'hisi_sccl,hha': 'hisi_sccl,hha',
           'hisi_sccl,l3c': 'hisi_sccl,l3c',
           'imx8_ddr': 'imx8_ddr',
+          'imx9_ddr': 'imx9_ddr',
           'L3PMC': 'amd_l3',
           'DFPMC': 'amd_df',
           'UMCPMC': 'amd_umc',