wiringPi: Define a symbol for aml_i2c

Change-Id: Ic2b2495d153babce0c8cd9ff33927533fe92e3b0

gpio/gpio_odroid.c

@@ -234,7 +234,7 @@ static void doI2Cdetect (UNU int argc, char *argv [])
 
 	switch (maker) {
 	case MAKER_AMLOGIC:
-		if (!moduleLoaded ("aml_i2c")) {
+		if (!moduleLoaded (AML_MODULE_I2C)) {
 			fprintf (stderr, "%s: The I2C kernel module(s) are not loaded.\n", argv [0]) ;
 			return ;
 		}

wiringPi/wiringOdroid.h

@@ -70,6 +70,9 @@
 #define	PUD_DOWN		1
 #define	PUD_UP			2
 
+// Module names
+#define AML_MODULE_I2C		"aml_i2c"
+
 /*----------------------------------------------------------------------------*/
 #define	PAGE_SIZE		(4*1024)
 #define	BLOCK_SIZE		(4*1024)