linux-gbmc: Use SWRST for reboot

Change-Id: Ia0400d2d579d06a9d97e524ac1d747219700f9b9
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/recipes-kernel/linux/files/npcm7xx-gbmc.dtsi b/recipes-kernel/linux/files/npcm7xx-gbmc.dtsi
index 125acfe..834a2b9 100644
--- a/recipes-kernel/linux/files/npcm7xx-gbmc.dtsi
+++ b/recipes-kernel/linux/files/npcm7xx-gbmc.dtsi
@@ -33,6 +33,10 @@
 	status = "okay";
 };
 
+&rstc {
+	nuvoton,sw-reset-number = <2>;
+};
+
 &watchdog1 {
 	status = "okay";
 };