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Refactor FDT part of gpioled driver

Description

Refactor FDT part of gpioled driver

  • Split driver in two parts: FDT and non-FDT
  • Instead of reattach gpioled nodes to GPIO bus use gpio_pin_get_by_ofw_idx and add ofwbus and simplebus as parrent buses

Reviewed by: loos
Differential Revision: https://reviews.freebsd.org/D8233