Use original names for config parameters

The config parameter names defined in the relay_chn_defs.h file
have been changed back to their original names (with the CONFIG_ prefix),
so that they are not confused with application-level defines.

Refs #1085

private_include/relay_chn_ctl.h

@@ -31,7 +31,7 @@ esp_err_t relay_chn_ctl_init(relay_chn_output_t *output, relay_chn_run_info_t *r
  */
 void relay_chn_ctl_deinit(void);
 
-#if RELAY_CHN_COUNT > 1
+#if CONFIG_RELAY_CHN_COUNT > 1
 /**
  * @brief Get the control structure for a specific relay channel.
  * 
@@ -49,7 +49,7 @@ relay_chn_ctl_t *relay_chn_ctl_get(uint8_t chn_id);
 relay_chn_ctl_t *relay_chn_ctl_get_all(void);
 #else
 relay_chn_ctl_t *relay_chn_ctl_get(void);
-#endif // RELAY_CHN_COUNT > 1
+#endif // CONFIG_RELAY_CHN_COUNT > 1
 
 #ifdef __cplusplus
 }