MIPS: Fix wrong comments in asm/prom.h
In arch/mips/include/asm/prom.h, it should use "!CONFIG_USE_OF"
after #else and #endif.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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