drm/i915: Remove runtime PM for SNB

Remove runtime PM support for SNB as it breaks hotplug support.
Feedback from V. Syrjala.

Signed-off-by: Carlos Santa <carlos.santa@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/i915/i915_pci.c

@@ -199,7 +199,6 @@ static const struct intel_device_info intel_ironlake_m_info = {
 	.gen = 6, .num_pipes = 2, \
 	.need_gfx_hws = 1, .has_hotplug = 1, \
 	.has_fbc = 1, \
-	.has_runtime_pm = 1, \
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING, \
 	.has_llc = 1, \
 	GEN_DEFAULT_PIPEOFFSETS, \