esoc: Reorder the events in graceful shutdown case.

The correct order for graceful shutdown should be: send sysmon-shutdown,
call the poweroff clinet hooks and finally pull the reset line to low
to trigger a poweroff of the modem.

Change-Id: Ife1aa1db3bcb5aaf2dd643885502ab0bdf005149
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>