cleanup imx6/7 CCM related CHECK_DTBS warnings

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
Changes in v3:
- fix wrong set minItem to 4 at binding doc.
- Link to v2: https://lore.kernel.org/r/20251106-ccm_dts-v2-0-12fa4c51fde7@nxp.com (local)

Changes in v2:
- rename enet_ref_pad from enet1_ref_pad (only 6ul use this name).
- Link to v1: https://lore.kernel.org/r/20251105-ccm_dts-v1-0-6aadcdf97cb8@nxp.com (local)

---
Frank Li (3):
      dt-bindings: clock: imx6q[ul]-clock: add optional clock enet[1]_ref_pad
      ARM: dts: imx6qdl: add label for system clocks
      ARM: dts: imx: add required clocks and clock-names for ccm

 .../devicetree/bindings/clock/imx6q-clock.yaml         |  4 ++++
 .../devicetree/bindings/clock/imx6ul-clock.yaml        |  4 ++++
 arch/arm/boot/dts/nxp/imx/imx6dl-alti6p.dts            |  4 ++--
 arch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts  |  4 ++--
 arch/arm/boot/dts/nxp/imx/imx6dl-lanmcu.dts            |  4 ++--
 arch/arm/boot/dts/nxp/imx/imx6dl-plybas.dts            |  4 ++--
 arch/arm/boot/dts/nxp/imx/imx6dl-plym2m.dts            |  4 ++--
 arch/arm/boot/dts/nxp/imx/imx6dl-prtmvt.dts            |  4 ++--
 arch/arm/boot/dts/nxp/imx/imx6dl-qmx6.dtsi             |  5 +++--
 arch/arm/boot/dts/nxp/imx/imx6dl-victgo.dts            |  4 ++--
 arch/arm/boot/dts/nxp/imx/imx6q-prtwd2.dts             |  4 ++--
 arch/arm/boot/dts/nxp/imx/imx6qdl-skov-cpu.dtsi        |  4 ++--
 arch/arm/boot/dts/nxp/imx/imx6qdl.dtsi                 | 18 +++++++++++++++---
 13 files changed, 44 insertions(+), 23 deletions(-)
---
base-commit: d1d799fccb5002df8cd355c0a849cf4efcda4ac1
change-id: 20251104-ccm_dts-504ea501251b

Best regards,
--
Frank Li [off-list ref]