Make rockpi image boot from wherever it is installed

Use boot scripts for detecting, and a systemd service for mounting /boot

Change-Id: I70ee352d8d773f92c11564f3a8ddd25800d2bba2
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/frc971/rockpi/contents/boot/boot.script b/frc971/rockpi/contents/boot/boot.script
new file mode 100644
index 0000000..26732b6
--- /dev/null
+++ b/frc971/rockpi/contents/boot/boot.script
@@ -0,0 +1,6 @@
+if test ${devnum} -eq 1;
+then
+  sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} sdcard_extlinux.conf
+else
+  sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} emmc_extlinux.conf
+fi