drm/i915/gt: fix platform prefix

gen8_clear_engine_error_register() is actually not used by
GRAPHICS_VER >= 8, since for those we are using another register that is
not engine-dependent. Fix the platform prefix, to make clear we are not
using any GEN6_RING_FAULT_REG_* one GRAPHICS_VER >= 8.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210720232014.3302645-2-lucas.demarchi@intel.com

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

@@ -205,7 +205,7 @@ static void clear_register(struct intel_uncore *uncore, i915_reg_t reg)
 	intel_uncore_rmw(uncore, reg, 0, 0);
 }
 
-static void gen8_clear_engine_error_register(struct intel_engine_cs *engine)
+static void gen6_clear_engine_error_register(struct intel_engine_cs *engine)
 {
 	GEN6_RING_FAULT_REG_RMW(engine, RING_FAULT_VALID, 0);
 	GEN6_RING_FAULT_REG_POSTING_READ(engine);
@@ -251,7 +251,7 @@ intel_gt_clear_error_registers(struct intel_gt *gt,
 		enum intel_engine_id id;
 
 		for_each_engine_masked(engine, gt, engine_mask, id)
-			gen8_clear_engine_error_register(engine);
+			gen6_clear_engine_error_register(engine);
 	}
 }