Add i.MX91 9x9 QSB basic support.

Signed-off-by: Joy Zou <redacted>
---
Changes in v2:
- Add three new patches to remove the clock-frequency property from mdio node.
- Remove the clock-frequency property from mdio node for patch #5.
- Correct GPIO pin number typo: <&gpio3 00 GPIO_ACTIVE_LOW> to <&gpio3 0 GPIO_ACTIVE_LOW> for patch #5.
- Add whitespace before brace in BUCK4 node for patch #5.
- Remove one level of indentation for rtc node for patch #5.
- Add Acked-by and Reviewed-by tag for patch #1.
- Add Reviewed-by tag for patch #5.
- Link to v1: https://lore.kernel.org/r/20260319-b4-imx91-qsb-dts-v1-0-2eedc01d8af0@nxp.com (local)

---
Joy Zou (5):
      dt-bindings: arm: fsl: add i.MX91 9x9 QSB board
      arm64: dts: imx91-11x11-evk: remove unused property clock-frequency from mdio node
      arm64: dts: imx93-11x11-evk: remove unused property clock-frequency from mdio node
      arm64: dts: imx93-9x9-qsb: remove unused property clock-frequency from mdio node
      arm64: dts: freescale: add i.MX91 9x9 QSB basic support

 Documentation/devicetree/bindings/arm/fsl.yaml     |   1 +
 arch/arm64/boot/dts/freescale/Makefile             |   1 +
 arch/arm64/boot/dts/freescale/imx91-11x11-evk.dts  |   1 -
 arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts    | 425 +++++++++++++++++++++
 .../boot/dts/freescale/imx93-11x11-evk-common.dtsi |   1 -
 arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts    |   1 -
 6 files changed, 427 insertions(+), 3 deletions(-)
---
base-commit: 8e42d2514a7e8eb8d740d0ba82339dd6c0b6463f
change-id: 20260319-b4-imx91-qsb-dts-ce089fb28353

Best regards,
-- 
Joy Zou [off-list ref]