Updated SiliconPlatformPort for 'o' and 'oe' output pad types #30
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Previously 'o' pad type represented by SiliconPlatformPort had 'oe' pin that was always disconnected in the designs but present in the final RTLIL (connected to zero, that should expect disabling the output pad) and ignored in the backend.
With this PR 'o' pad type represented by SiliconPlatformPort without 'oe' pin and only with 'o' pin (expected behavior),
and 'oe' pad type represented by SiliconPlatformPort with both 'o' and 'oe' pins that makes it suitable for open drain.