i2c-nomadik: turn the platform driver to an amba driver

i2c-nomadik: turn the platform driver to an amba driver

The i2c-nomadik gateware is really a PrimeCell APB device. By hosting
the driver under the amba bus we can access it more easily, for
example using the generic pci-amba driver. The patch also fixes the
mach-ux500 users, so they register an amba device instead than a
platform device.

Signed-off-by: Alessandro Rubini <[email protected]>
Acked-by: Giancarlo Asnaghi <[email protected]>
Tested-by: Linus Walleij <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>