esp8285: properly initialize available gpio as inputs

[d-a-v]

per #7041 (comment) following #7044 @dok-net

[d-a-v]

@ivankravets @valeros Something has gone wrong with CI on platformio:

fatal: Remote branch feature/stage not found in upstream origin

Error: VCS: Could not process command ['git', 'clone', '--recursive', '--depth', '1', '--branch', 'feature/stage', 'https://github.com/platformio/platform-espressif8266.git', '/home/travis/.platformio/platforms/_tmp_installing-bew4mnvj-package']

Please tell us (or @ivankravets can fix it) which branch we should run CI against, thanks !

[ivankravets]

Sorry for the issue, we removed legacy stage branch due to a new way how developers can switch to dev-version of this repository. See https://docs.platformio.org/en/latest/platforms/espressif8266.html#using-arduino-framework-with-staging-version

@valeros will provide PR soon.

[ivankravets]

Resolved in #7170

[d-a-v]

Thanks !