The pinout for the Low Speed Expansion on the MinnowBoard Turbot is the same as the MinnowBoard MAX A2 desgin, with the exception of pin 26. Pin 26 was changed to provide an MCLK reference clock for I2S. In addition, the D2 LED is now under GPIO control. Add support for these changes. Signed-off-by: Constantin Musca <constantin.musca@intel.com> Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>