We do not yet support UTHREADS in xPL phases. However, we have the need
to dummy out certain functions so that xPL can build when full U-Boot
has UTHREADS enabled. Update the few places that need to use
CONFIG_IS_ENABLED so that we have the correct dummy in xPL.
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>