drm: drop DRIVER_HAVE_IRQ flag for some drivers

Since commit 4984979b9b90 ("drm/irq: simplify irq checks in
drm_wait_vblank"), the drm driver feature flag DRIVER_HAVE_IRQ is only
required for drivers that have an IRQ handler managed by the DRM core.
Some drivers, armada, etnaviv, kirin and sti, set this flag without
.irq_handler setup in drm_driver.  These drivers manage IRQ handler
by themselves and the flag DRIVER_HAVE_IRQ makes no sense there.

Drop the flag for these drivers to avoid confusion.

Signed-off-by: Shawn Guo <[email protected]>
Cc: Vincent Abriou <[email protected]>
Cc: Xinliang Liu <[email protected]>
Acked-by: Russell King <[email protected]> (for armada and etnaviv)
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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