viafb: Turn GPIO and i2c into proper platform devices

Another step toward making this thing a real multifunction device driver.

Cc: [email protected]
Cc: [email protected]
Cc: Harald Welte <[email protected]>
Acked-by: Florian Tobias Schandinat <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
6 files changed