MAINTAINERS: include fsl_imx9_ddr_perf.c and some perf metric files

The fsl_imx9_ddr_perf.c and some perf metric files under
tools/perf/pmu-events/arch/arm64/freescale/ is missing in MAINTAINERS.
Add them and add me as another maintainer.

Reviewed-by: Frank Li <[email protected]>
Signed-off-by: Xu Yang <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

Author: Xu Yang

MAINTAINERS

@@ -9744,11 +9744,14 @@ F:	drivers/video/fbdev/imxfb.c
 
 FREESCALE IMX DDR PMU DRIVER
 M:	Frank Li <[email protected]>
+M:	Xu Yang <[email protected]>
 L:	[email protected] (moderated for non-subscribers)
 S:	Maintained
 F:	Documentation/admin-guide/perf/imx-ddr.rst
 F:	Documentation/devicetree/bindings/perf/fsl-imx-ddr.yaml
 F:	drivers/perf/fsl_imx8_ddr_perf.c
+F:	drivers/perf/fsl_imx9_ddr_perf.c
+F:	tools/perf/pmu-events/arch/arm64/freescale/
 
 FREESCALE IMX I2C DRIVER
 M:	Oleksij Rempel <[email protected]>