NFC: trf7970a: Call spi_setup() to configure SPI communication

Call spi_setup() to configure SPI communication
with the trf7970a.  This will ensure that the
correct SPI parameters are used.

Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>