libnetutils: Add ifc_enable(), for enabling a network interface.

Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/libnetutils/ifc_utils.c b/libnetutils/ifc_utils.c
index 88635d9..bde336f 100644
--- a/libnetutils/ifc_utils.c
+++ b/libnetutils/ifc_utils.c
@@ -224,6 +224,16 @@
     return result;
 }
 
+int ifc_enable(const char *ifname)
+{
+    int result;
+
+    ifc_init();
+    result = ifc_up(ifname);
+    ifc_close();
+    return result;
+}
+
 int ifc_disable(const char *ifname)
 {
     int result;