Add support for MIPS-based boards Omega2 and Linkit Smart 7688

Signed-off-by: Serge Vakulenko <vak@besm6.org>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

include/mraa_internal.h

@@ -65,6 +65,13 @@ mraa_platform_t mraa_x86_platform();
  */
 mraa_platform_t mraa_arm_platform();
 
+/**
+ * runtime detect running mips platforms
+ *
+ * @return mraa_platform_t of the init'ed platform
+ */
+mraa_platform_t mraa_mips_platform();
+
 /**
  * setup a mock platform
  *