drm/i915/vlv: add early DPIO init v3

Just add an early init since we may need to access DPIO regs early on.
The init call in modeset_init_hw is also needed for the resume case,
when we need to reset DPIO to keep things happy.

v2: split reset and reg init
v3: split patches (Daniel)
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -10871,6 +10871,8 @@ void intel_modeset_init(struct drm_device *dev)
 		}
 	}
 
+	intel_init_dpio(dev);
+
 	intel_cpu_pll_init(dev);
 	intel_shared_dpll_init(dev);