Add reboot-bootloader script

- Add /usr/sbin/reboot-bootloader, which writes to the watchdog's
reboot_bootloader node, and then issues a reboot command.

Change-Id: Ic4e733da4270d29969a4ef431694d1a56c220f0f

usr/sbin/reboot-bootloader

diff --git a/usr/sbin/reboot-bootloader b/usr/sbin/reboot-bootloader
new file mode 100644
index 0000000..27aa02e
--- /dev/null
+++ b/usr/sbin/reboot-bootloader
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+if [[ ${UID} -ne 0 ]]; then
+    echo "Please execute as root!"
+    exit -1
+fi
+
+echo 1 | tee /sys/devices/platform/soc/10007000.toprgu/reset_bootloader
+reboot