Add ril v2 support.

Change-Id: I14f4d5f3650f0d397c38a72e8bea2600c17b07de
diff --git a/mbtk/libmbtk_lib_v2/common/mbtk_gpio.c b/mbtk/libmbtk_lib_v2/common/mbtk_gpio.c
index 0116f60..d80b014 100755
--- a/mbtk/libmbtk_lib_v2/common/mbtk_gpio.c
+++ b/mbtk/libmbtk_lib_v2/common/mbtk_gpio.c
@@ -12,7 +12,7 @@
 #include "mbtk_gpio.h"
 
 
-static int gpio_export(int gpio)
+int gpio_export(int gpio)
 {
     int fd = -1;
     char buffer[50];
@@ -44,7 +44,7 @@
     return 0;
 }
 
-static int gpio_unexport(int gpio)
+int gpio_unexport(int gpio)
 {
     int fd = -1;
     char buffer[50];