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With in-kernel emulated eiointc driver, hardware register can be accessed by different size, there is reg_u8/reg_u16/reg_u32/reg_u64 union type with EIOINTC register. Here use 64-bit type with register definition and remove union type since most registers are accessed with 64-bit method. And this makes EIOINTC emulated driver simpler. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>