healthd: charger: only reboot under NORMAL mode

If charger is not launched from normal poweroff charging,
we don't want device to reboot. Just leave charger process
to exit by itself but not reboot when not under NORMAL mode.

Change-Id: I9f6535042d7016e21d172d167069a134c8851fa6
Revert "healthd: charger: Support alarm in power off charging mode"

This reverts commit 0041eb9ba5643c99724fa92e79886deb5758c8e1.

Change-Id: I6920564d072c13d9219a90816f4a21bc5f5b63fd
healthd: Support alarm in power off charging mode

To implement this feature need to let the phone reboot some time
earlier than the alarm time.

Change-Id: I6505a99b51932ffa23518769f8fd4d2590021543