Reduce icom.c 0x25 warning to trace level -- the error is expected when rig does not support 0x25

rigs/icom/icom.c

@@ -1653,8 +1653,8 @@ int icom_get_freq(RIG *rig, vfo_t vfo, freq_t *freq)
         if (retval != RIG_OK)
         {
             if (priv->x25cmdfails < 0) priv->x25cmdfails = 1;
-            rig_debug(RIG_DEBUG_WARN,
-                      "%s: rig probe shows 0x25 CI-V cmd not available\n", __func__);
+            rig_debug(RIG_DEBUG_TRACE,
+                      "%s: rig probe shows 0x25 CI-V cmd not available for this rig/firmware\n", __func__);
         }
 
         freq_len--; // 0x25 cmd is 1 byte longer than 0x03 cmd