[Skiboot] [PATCH 0/3 v3] skiboot flash layer implementation & API

[Jeremy Kerr]

This series is v3 of my flash layer updates, which allow OS access to a PNOR
device, through a new OPAL API. We then port the load_resource and flash
interfaces to use this flash layer

v3:
 - Fix opal_flash_op arguments
 - Port to new load_resource updates

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Jeremy Kerr (3):
      core/flash: Add flash API
      core/flash: port pnor_load_resource to flash code
      core/flash: Move flash NVRAM handling to new flash module