drm: Make vblank_enabled bool

vblank_enabled is only ever 0 or 1, so make it a bool.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --cc drivers/gpu/drm/drm_irq.c
Simple merge

diff --cc drivers/gpu/drm/omapdrm/omap_irq.c
Simple merge

diff --cc include/drm/drmP.h
Simple merge