drm/i915/gt: Use intel_gt as the primary object for handling resets

Having taken the first step in encapsulating the functionality by moving
the related files under gt/, the next step is to start encapsulating by
passing around the relevant structs rather than the global
drm_i915_private. In this step, we pass intel_gt to intel_reset.c

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190712192953.9187-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_selftest.h

@@ -72,6 +72,9 @@ int __i915_nop_teardown(int err, void *data);
 int __i915_live_setup(void *data);
 int __i915_live_teardown(int err, void *data);
 
+int __intel_gt_live_setup(void *data);
+int __intel_gt_live_teardown(int err, void *data);
+
 int __i915_subtests(const char *caller,
 		    int (*setup)(void *data),
 		    int (*teardown)(int err, void *data),
@@ -88,6 +91,12 @@ int __i915_subtests(const char *caller,
 			__i915_live_setup, __i915_live_teardown, \
 			T, ARRAY_SIZE(T), data); \
 })
+#define intel_gt_live_subtests(T, data) ({ \
+	typecheck(struct intel_gt *, data); \
+	__i915_subtests(__func__, \
+			__intel_gt_live_setup, __intel_gt_live_teardown, \
+			T, ARRAY_SIZE(T), data); \
+})
 
 #define SUBTEST(x) { x, #x }