x86: quark: Fix unused warnings
The variable t_rfc is never used, so drop it. The variables ddr_wctl and ddr_wcmd are only used in certain manual instances, so guard their declaration by the same check as their use. Cc: Bin Meng <bmeng.cn@gmail.com> Signed-off-by: NTom Rini <trini@konsulko.com> Reviewed-by: NBin Meng <bmeng.cn@gmail.com> Tested-by: NBin Meng <bmeng.cn@gmail.com>
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