irqchip: spear_shirq: Kill the clear_reg nonsense
None of the chips has a ACK register. The code brainlessly fiddles with the enable register, so it might even reenable a disabled interrupt at least on spear300. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20140619212713.570396433@linutronix.deAcked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NJason Cooper <jason@lakedaemon.net>
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