drm/exynos/decon: make irq handler static

The function is used only locally.

Signed-off-by: Andrzej Hajda <[e-mail]>
Signed-off-by: Inki Dae <[e-mail]>

drivers/gpu/drm/exynos/exynos5433_drm_decon.c

···
 	set_bit(BIT_SUSPENDED, &ctx->flags);
 }
 
-void decon_te_irq_handler(struct exynos_drm_crtc *crtc)
+static void decon_te_irq_handler(struct exynos_drm_crtc *crtc)
 {
 	struct decon_context *ctx = crtc->ctx;