Add GPT entries to sysupgrade image

Piotr Kubikrequested to merge
pkubik-sysupgrade-add-gpt-entries into mkshevetskiy-gpt
  • common: upgrade FIT: Add support for defining values
  • airoha: Add GPT entries to sysupgrade image
  • airoha: Add GPT variables to DEVICE_VARS

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