Convert qoria-clock DT binding to yaml format. Split to two files
qoriq-clock.yaml and qoriq-clock-legancy.yaml.

Addtional change:
- Remove clock consumer part in example
- Fixed example dts error
- Deprecated legancy node
- fsl,b4420-clockgen and fsl,b4860-clockgen fallback to fsl,b4-clockgen.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240701205809.1978389-1-Frank.Li@nxp.comReviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>