Fix compatible field for LEDs

Change-Id: I367618c10cde7854863537872a9317c5a82a1b45
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/gen_devtree.pl b/gen_devtree.pl
index daf59a8..f7241b7 100755
--- a/gen_devtree.pl
+++ b/gen_devtree.pl
@@ -431,7 +431,7 @@
 {
     my %leds;
 
-    $leds{compatible} = "gpio-led";
+    $leds{compatible} = "gpio-leds";
 
     my $connections = findConnections($g_bmc, "GPIO", "LED");