Revert "chroot: kill battery_monitor.service till its fixed"

This reverts commit 1b350e17

.

this is now fixed in /usr/bin/battery_monitor

root@beaglebone:~# /usr/bin/battery_monitor
TI AM335x BeagleBone Green Wireless (UNSUPPORTED breaks wl18xx exiting...)

root@beaglebone:~# /usr/bin/battery_monitor
TI AM335x BeagleBone Blue

2S Pack   Jack   #Cells   Cell
 8.22V   12.11V     4     3.03V   ^Cbattery_monitor exiting cleanly

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

scripts/chroot.sh

@@ -917,10 +917,6 @@ cat > "${DIR}/chroot_script.sh" <<-__EOF__
 			systemctl enable capemgr.service || true
 		fi
 
-		if [ -f /lib/systemd/system/battery_monitor.service ] ; then
-			systemctl disable battery_monitor.service || true
-		fi
-
 		if [ ! "x${rfs_opt_scripts}" = "x" ] ; then
 			mkdir -p /opt/scripts/ || true