[U-Boot] [PATCH] ARM: rockchip: rock: Correct test to use CONFIG_IS_ENABLED not defined

[Dr. Philipp Tomsich]

> On 14 Aug 2017, at 19:24, Tom Rini <trini at konsulko.com> wrote:
> 
> While it is likely that this entire case is superfluous and can be
> removed, correct the test now to match what is in rockchip-common.h and
> makes sense based on context of the code.  Otherwise we get a large
> number of warnings.
> 
> Cc: hilipp Tomsich <philipp.tomsich at theobroma-systems.com>
> Signed-off-by: Tom Rini <trini at konsulko.com>

Reviewed-by: Philipp Tomsich < philipp.tomsich at theobroma-systems.com>