drm/i915/sseu: Move sseu detection and dump to intel_sseu

Keep all the SSEU code in the relevant file. The code has also been
updated to use intel_gt instead of dev_priv.

Based on an original patch by Sandeep.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Andi Shyti <andi.shyti@intel.com>
Cc: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200708003952.21831-7-daniele.ceraolospurio@intel.com

drivers/gpu/drm/i915/gt/intel_gt.c

@@ -47,6 +47,7 @@ void intel_gt_init_hw_early(struct intel_gt *gt, struct i915_ggtt *ggtt)
 int intel_gt_init_mmio(struct intel_gt *gt)
 {
 	intel_uc_init_mmio(&gt->uc);
+	intel_sseu_info_init(gt);
 
 	return intel_engines_init_mmio(gt);
 }