wlan: Don't update channel list in 1st scan when SET_FCC_CHANNEL is set

Currently SET_FCC_CHANNEL issues updated channel list to fw.
At the time of driver load, if scan is issued followed with
SET_FCC_CHANNEL, driver will send update channel list to fw.
Fw will stop ongoing scan because of that GUI will have very less
scan list.
Fix this with sending update channel list after scan is done.

Change-Id: I99465eeddf75ee6a3f525d43c227e2a8972a73e5
CRs-Fixed: 972208
diff --git a/CORE/SME/inc/csrInternal.h b/CORE/SME/inc/csrInternal.h
index daf16c9..cb13a47 100644
--- a/CORE/SME/inc/csrInternal.h
+++ b/CORE/SME/inc/csrInternal.h
@@ -833,6 +833,8 @@
     csrScanCompleteCallback callback11dScanDone;
     eCsrBand  scanBandPreference;  //This defines the band perference for scan
     bool fcc_constraint;
+    /* flag to defer updated chanel list */
+    bool defer_update_channel_list;
 }tCsrScanStruct;