metrics: fix variable declaration in header

The global variable "tel_met_data" was declared in a header file, rather
than in a C file, leading to duplicate definitions if more than one C
file included the header.

Fixes: c5b7197f66 ("telemetry: move some functions to metrics library")
Cc: stable@dpdk.org

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>

lib/librte_metrics/rte_metrics_telemetry.c

@@ -13,6 +13,8 @@
 #include "rte_metrics.h"
 #include "rte_metrics_telemetry.h"
 
+struct telemetry_metrics_data tel_met_data;
+
 int metrics_log_level;
 
 /* Logging Macros */

lib/librte_metrics/rte_metrics_telemetry.h

@@ -34,8 +34,6 @@ struct telemetry_metrics_data {
 	int metrics_register_done;
 };
 
-struct telemetry_metrics_data tel_met_data;
-
 __rte_experimental
 int32_t rte_metrics_tel_reg_all_ethdev(int *metrics_register_done,
 		int *reg_index_list);