pwm: Use pinmap functions for setting up pwm.

* Intended function of check_pwm also checks for conflicting gpio, due
* to quirk on galileo rev d, functionality commented.

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

api/maa.h

@@ -185,6 +185,15 @@ unsigned int maa_check_aio(int pin);
  */
 unsigned int maa_check_i2c();
 
+/** Check PWM
+ *
+ * Will check input is valid for pwm and will also setup required multiplexers.
+ * IF the pin also does gpio (strong chance), DO NOTHING, REV D is strange.
+ * @param pin the pin as read from the board surface.
+ * @return the pwm pin_info_t of that IO pin
+ */
+maa_pin_t* maa_check_pwm(int pin);
+
 /** Get the version string of maa autogenerated from git tag
  *
  * The version returned may not be what is expected however it is a reliable