coresight: Remove unused ETM Perf stubs

This file is never included anywhere if CONFIG_CORESIGHT is not set so
they are unused and aren't currently compile tested with any config so
remove them.

Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: James Clark <james.clark@arm.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Tested-by: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20240722101202.26915-10-james.clark@linaro.org

Author: James-A-Clark

drivers/hwtracing/coresight/coresight-etm-perf.h

@@ -62,7 +62,6 @@ struct etm_event_data {
 	struct list_head * __percpu *path;
 };
 
-#if IS_ENABLED(CONFIG_CORESIGHT)
 int etm_perf_symlink(struct coresight_device *csdev, bool link);
 int etm_perf_add_symlink_sink(struct coresight_device *csdev);
 void etm_perf_del_symlink_sink(struct coresight_device *csdev);
@@ -77,23 +76,6 @@ static inline void *etm_perf_sink_config(struct perf_output_handle *handle)
 int etm_perf_add_symlink_cscfg(struct device *dev,
 			       struct cscfg_config_desc *config_desc);
 void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *config_desc);
-#else
-static inline int etm_perf_symlink(struct coresight_device *csdev, bool link)
-{ return -EINVAL; }
-int etm_perf_add_symlink_sink(struct coresight_device *csdev)
-{ return -EINVAL; }
-void etm_perf_del_symlink_sink(struct coresight_device *csdev) {}
-static inline void *etm_perf_sink_config(struct perf_output_handle *handle)
-{
-	return NULL;
-}
-int etm_perf_add_symlink_cscfg(struct device *dev,
-			       struct cscfg_config_desc *config_desc)
-{ return -EINVAL; }
-void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *config_desc) {}
-
-#endif /* CONFIG_CORESIGHT */
-
 int __init etm_perf_init(void);
 void etm_perf_exit(void);