dt-bindings: backlight: lp855x: Convert to YAML and modernize

Notable changes:
- ROM child nodes use dashes instead of underscores; the driver
  reads all child nodes regardless of their names, so this doesn't
  break ABI.
- pwm-period argument is deprecated, as it effectively duplicates
  the period value provided in pwms. The driver continues to accept
  the property, so this should not break ABI.

Signed-off-by: Artur Weber <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Daniel Thompson <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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