ARM: imx6: fix setting up pm_power_off callback

It is not necessarily that the system with set up the
POWER_RESET_GPIO config option has the enabled device "gpio-poweroff".
Without this device the "pm_power_off" callback remains uninitialized
and the syscall "reboot" converts the signal LINUX_REBOOT_CMD_POWER_OFF
into LINUX_REBOOT_CMD_HALT.
This leads to skip calling the callback "pm_power_off_prepare" that
should do an important work for iMX6+PF0100 systems: it should turns
down all power rails of PMIC PF0100 to emulate a "power off" state as a
workaround for a PMIC PF0100 with PMIC_ON_REQ and VCC_BATT is supplied
from a battery, leading to unable to restart the module either by RESET
or power cycle.

Note, that gpio-poweroff device still can grab the pm_power_off callback
using the property "force-mode" introduced in the commit:
964f69e00a4d ("power: reset: gpio-poweroff: add force-mode")

Enable setting pm_power_off callback on the system with POWER_RESET_GPIO
config option.

Related-to: ELB-3580
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
(cherry-picked from aebbdbb42fbec323d242a6c0fb5fe6c97636ee3e)

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