ARM: tegra: Enable poweroff command on Jetson TX2

This command is useful to power off the system from within U-Boot.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Tom <twarren@nvidia.com>
diff --git a/configs/p2771-0000-500_defconfig b/configs/p2771-0000-500_defconfig
index c99a24e..5ffff2c 100644
--- a/configs/p2771-0000-500_defconfig
+++ b/configs/p2771-0000-500_defconfig
@@ -24,6 +24,7 @@
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_PCI=y
+CONFIG_CMD_POWEROFF=y
 CONFIG_CMD_SPI=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_BOOTP_PREFER_SERVERIP=y