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>
diff --git a/configs/qemu-ppce500_defconfig b/configs/qemu-ppce500_defconfig
index b2510c8..c5e2ad3 100644
--- a/configs/qemu-ppce500_defconfig
+++ b/configs/qemu-ppce500_defconfig
@@ -1,6 +1,7 @@
 CONFIG_PPC=y
 CONFIG_SYS_TEXT_BASE=0xf01000
 CONFIG_ENV_SIZE=0x2000
+CONFIG_DM_GPIO=y
 CONFIG_MPC85xx=y
 # CONFIG_CMD_ERRATA is not set
 CONFIG_TARGET_QEMU_PPCE500=y
@@ -15,6 +16,7 @@
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_GREPENV=y
 CONFIG_CMD_DM=y
+CONFIG_CMD_GPIO=y
 CONFIG_CMD_PCI=y
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_PING=y
@@ -28,6 +30,7 @@
 CONFIG_DM=y
 CONFIG_BLK=y
 CONFIG_HAVE_BLOCK_DEVICE=y
+CONFIG_MPC8XXX_GPIO=y
 # CONFIG_MMC is not set
 CONFIG_DM_ETH=y
 CONFIG_E1000=y