qcacmn: Replace CONFIG_MCL_REGDB with CONFIG_REG_CLIENT

Do not use MCL in the macro. Use feature name to define macro.

This is for CONFIG_MCL_REGDB cleanup.

Change-Id: I5a3f40da74e2c4476dbf2d4d4200502b9b9e9653
CRs-Fixed: 2411991

umac/regulatory/dispatcher/inc/wlan_reg_services_api.h

@@ -177,7 +177,7 @@ QDF_STATUS wlan_reg_get_channel_list_with_power(struct wlan_objmgr_pdev *pdev,
 QDF_STATUS wlan_reg_read_default_country(struct wlan_objmgr_psoc *psoc,
 				   uint8_t *country);
 
-#ifdef CONFIG_MCL_REGDB
+#ifdef CONFIG_REG_CLIENT
 /**
  * wlan_reg_read_current_country() - Read the current country for the regdomain
  * @country: pointer to the country code.