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>

src/mraa.c

@@ -144,6 +144,9 @@ imraa_init()
 #elif defined(ARMPLAT)
         // Use runtime ARM platform detection
         platform_type = mraa_arm_platform();
+#elif defined(MIPSPLAT)
+        // Use runtime ARM platform detection
+        platform_type = mraa_mips_platform();
 #elif defined(MOCKPLAT)
         // Use mock platform
         platform_type = mraa_mock_platform();