Create SPI driver class source and header files. see #25
Clean up and change symbol names within SPI driver class. see #25
Add SPI driver class methods for setting and getting SPI module transfer count. see #25
Add several SPI module configuration methods. see #25
Add more SPI module configuration methods. see #25
Add SPI module configuration methods and full register access set and get methods. see #25
Merge master to cr-25.
Add SPI module clock and transfer attributes related methods. see #25
Add SPI module clock and transfer attributes related methods. see #25
Add SPI status register related methods. see #25
Merge master to cr-25.
Add SPI driver class request select and enable register related methods. see #25
Add SPI driver class PUSH transmit FIFO register related methods. see #25
Add SPI driver class POP receive FIFO register, debug transmit FIFO register, and debug receive FIFO register related methods. see #25
Add SPI driver class full register access methods. see #25
Merge cr-25 to master.