qcacld-3.0: Regdomain kernel-doc and other changes

Add kernel documentation for regdomain data structures. Also
rename some of the data structures to better names.

Change-Id: Iae26079ae8a7f06e2670594694ae36c2c2a0a524
CRs-Fixed: 961806
diff --git a/core/sap/dfs/src/dfs.c b/core/sap/dfs/src/dfs.c
index d938c01..a2b5cff 100644
--- a/core/sap/dfs/src/dfs.c
+++ b/core/sap/dfs/src/dfs.c
@@ -61,7 +61,7 @@
 #include "dfs_ioctl.h"
 #include "dfs.h"
 
-int domainoverride = DFS_UNINIT_DOMAIN;
+int domainoverride = DFS_UNINIT_REGION;
 
 /*
 ** channel switch announcement (CSA)