drm/i915: Extract GT render power state management

i915_irq.c is large. One reason for this is that has a large chunk of
the GT render power management stashed away in it. Extract that logic
out of i915_irq.c and intel_pm.c and put it under one roof.

Based on a patch by Chris Wilson.

Signed-off-by: Andi Shyti <andi.shyti@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191024211642.7688-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_irq.h

@@ -22,9 +22,6 @@ struct intel_gt;
 struct intel_guc;
 struct intel_uncore;
 
-void gen11_rps_irq_handler(struct intel_gt *gt, u32 pm_iir);
-void gen6_rps_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir);
-
 void intel_irq_init(struct drm_i915_private *dev_priv);
 void intel_irq_fini(struct drm_i915_private *dev_priv);
 int intel_irq_install(struct drm_i915_private *dev_priv);