power: reset: pwr-mlxbf: support graceful reboot instead of emergency reset

Replace the soft reset with a graceful reboot.
An acpi event will be triggered by the irq in the pwr-mlxbf.c
to trigger the graceful reboot.

Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
Link: https://lore.kernel.org/r/20231030203058.8056-1-asmaa@nvidia.com


Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>