uboot-imx

configs: Re-sync CONFIG_CMD_IMLS with moveconfig

The option is specified in Kconfig, but still a few config header files
are overriding the choice by #undef'ing it. Re-sync the option with
moveconfig to rid of the #undefs.

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>