wlan: Implement GET_DISABLE_CHANNEL_LIST driver command

Implement GET_DISABLE_CHANNEL_LIST driver command to get disable
channel list programed by SET_DISABLE_CHANNEL_LIST driver command.

Change-Id: Ib741e1cd23cef105314325aaec86feb50f36a181
CRs-Fixed: 2201755
diff --git a/CORE/HDD/inc/wlan_hdd_main.h b/CORE/HDD/inc/wlan_hdd_main.h
index 2a3058e..fefbb0b 100644
--- a/CORE/HDD/inc/wlan_hdd_main.h
+++ b/CORE/HDD/inc/wlan_hdd_main.h
@@ -2363,4 +2363,16 @@
  */
 int hdd_parse_disable_chan_cmd(hdd_adapter_t *adapter, tANI_U8 *ptr);
 
+/*
+ * hdd_parse_disable_chn_cmd() - get disable channel list
+ * in command.
+ * @hdd_ctx: hdd context
+ * @buf: buffer to hold disable channel list
+ * @buf_len: buffer length
+ *
+ * @return: length of data copied to buf
+ */
+int hdd_get_disable_ch_list(hdd_context_t *hdd_ctx, tANI_U8 *buf,
+                            tANI_U8 buf_len);
+
 #endif    // end #if !defined( WLAN_HDD_MAIN_H )