wlan: Long initial scan time.

Initial Scan after driver load takes long time.As a part of fix
scan all non-dfs channels actively in the 1st scan.
Add new ini parameter, gInitialScanSkipDFSCh, to enable this feature.
By default this feature this enabled.

Change-Id: I3406bdb98bc835b0b04b623922e501ebdade1312
CRs-Fixed: 589316
diff --git a/CORE/SME/inc/csrInternal.h b/CORE/SME/inc/csrInternal.h
index a5f3bd3..ea3b13d 100644
--- a/CORE/SME/inc/csrInternal.h
+++ b/CORE/SME/inc/csrInternal.h
@@ -664,6 +664,7 @@
     tANI_U8 nSelect5GHzMargin;
     tANI_U8 isCoalesingInIBSSAllowed;
     tANI_U8 allowDFSChannelRoam;
+    tANI_BOOLEAN initialScanSkipDFSCh;
 }tCsrConfig;
 
 typedef struct tagCsrChannelPowerInfo