uboot-imx

power: twl4030: Add imply CMD_POWEROFF when TWL4030 is enabled

Now that CMD_POWEROFF can turn off the twl4030, let's imply that
just incase someone wants to disable it.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>