hwmon: (sht15) Root out platform data

After finding out there are active users of this sensor I noticed:

- It has a single PXA27x board file using the platform data
- The platform data is only used to carry two GPIO pins, all other
  fields are unused
- The driver does not use GPIO descriptors but the legacy GPIO
  API

I saw we can swiftly fix this by:

- Killing off the platform data entirely
- Define a GPIO descriptor lookup table in the board file
- Use the standard devm_gpiod_get() to grab the GPIO descriptors
  from either the device tree or the board file table.

This compiles, but needs testing.

Cc: [email protected]
Cc: Marco Franchi <[email protected]>
Cc: Davide Hug <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Tested-by: Marco Franchi <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>

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