spi-pinmap: added spi checking functions.

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>

api/maa.h

@@ -205,6 +205,12 @@ unsigned int maa_check_aio(int pin);
  */
 unsigned int maa_check_i2c();
 
+/** Check spi interface, sets up multiplexer on device.
+ *
+ * @return unsigned int if using /dev/spi-1.0 returned would be 1.0
+ */
+double maa_check_spi();
+
 /** Check PWM
  *
  * Will check input is valid for pwm and will also setup required multiplexers.