qcacmn: Update Regulatory version

Currently Regulatory DB is updated to 40th version
but in comment 38th version is added.

Change-Id: I65ea330e6c06965255bd84b8831c738bf18eee45
CRs-Fixed: 3253391

umac/regulatory/core/src/reg_db.c

@@ -21,7 +21,7 @@
 /**
  * DOC: reg_db.c
  * This file implements QCA regulatory database.
- * Current implementation conforms to database version 38.
+ * Current implementation conforms to database version 40.
  */
 
 #include <qdf_types.h>