ppc: qemu: Enable GPIO support

QEMU ppce500 target integrates a GPIO controller that is compatible
with the QorIQ GPIO controller. Enable the DM GPIO driver for it
and the 'gpio' command.

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