drm: Don't test for IRQ support in VBLANK ioctls

For KMS drivers, replace the IRQ check in VBLANK ioctls with a check for
vblank support. IRQs might be enabled wthout vblanking being supported.

This change also removes the DRM framework's only dependency on IRQ state
for non-legacy drivers. For legacy drivers with userspace modesetting,
the original test remains in drm_wait_vblank_ioctl().

v4:
	* avoid preprocessor ifdef in drm_wait_vblank_ioctl()
	  (Jani, Thierry)
v3:
	* optimize test in drm_wait_vblank_ioctl() for KMS case (Liviu)
	* update docs for drm_irq_uninstall()
v2:
	* keep the old test for legacy drivers in
	  drm_wait_vblank_ioctl() (Daniel)

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Liviu Dudau <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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