drm/exynos: move to use request_irq by IRQF_NO_AUTOEN flag

After this patch cbe16f35

 genirq: Add IRQF_NO_AUTOEN for
request_irq/nmi() is merged. request_irq() after setting
IRQ_NOAUTOEN as below

irq_set_status_flags(irq, IRQ_NOAUTOEN);
request_irq(dev, irq...);
can be replaced by request_irq() with IRQF_NO_AUTOEN flag.

v2:
Fix the problem of using wrong flags

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>