spi: dw: use plain struct device * at earlier ->probe()

The name of the master device is set during registrationg which happens after
we issue the error message. Change it to plain struct device * to see which
device registration failed.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>