ppc: qemu: Enable support for power off via GPIO

The QEMU ppce500 target provides the power off functionality via
the GPIO pin#0, and we can support this using the sysreset gpio
poweroff driver. Let's enable it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
1 file changed