u-boot: Enable USB with a preboot command

We need to initialize the USB subsystem before we can use USB devices
like keyboards and external disks, by running `usb start`. Use the
PREBOOT config option to run the necessary command before U-Boot tries
to automatically boot anything. It's already enabled for boards other
than gru_kevin and gru_bob, so just update those two configs.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

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