The DDR PMU on i.MX 8MP has its own compatible described in bindings and
used in the driver (with its own quirks).  Remove additional
fsl,imx8m-ddr-pmu compatible to fix dtbs_check warnings like:

  arch/arm64/boot/dts/freescale/imx8mq-nitrogen.dt.yaml: ddr-pmu@3d800000:
    compatible: ['fsl,imx8mq-ddr-pmu', 'fsl,imx8m-ddr-pmu'] is not valid under any of the given schemas (Possible causes of the failure):
    arch/arm64/boot/dts/freescale/imx8mq-nitrogen.dt.yaml: ddr-pmu@3d800000: compatible: ['fsl,imx8mq-ddr-pmu', 'fsl,imx8m-ddr-pmu'] is too long
    From schema: Docmentation/devicetree/bindings/perf/fsl-imx-ddr.yaml

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 arch/arm64/boot/dts/freescale/imx8mp.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
index 9de2aa1c573c..e34eff19fcae 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi

@@ -746,7 +746,7 @@
 		};
 
 		ddr-pmu@3d800000 {
-			compatible = "fsl,imx8mp-ddr-pmu", "fsl,imx8m-ddr-pmu";
+			compatible = "fsl,imx8mp-ddr-pmu";
 			reg = <0x3d800000 0x400000>;
 			interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;
 		};

-- 
2.17.1