qcacmn: Vendor command to get the configured band

This commit introduces the vendor command to get the configured band
through QCA_NL80211_VENDOR_SUBCMD_GETBAND.

Change-Id: I3f3de10a3bd32eda2634b400d5191bf67a46eaaa
CRs-fixed: 2729768

os_if/linux/qca_vendor.h

@@ -430,6 +430,11 @@
  *
  * @QCA_NL80211_VENDOR_SUBCMD_CONFIG_TWT: Vendor subcommand to configure TWT.
  *	Uses attributes defined in enum qca_wlan_vendor_attr_config_twt.
+ *
+ * @QCA_NL80211_VENDOR_SUBCMD_GETBAND: Command to get the configured band from
+ *	the host driver. The band configurations obtained are referred through
+ *	QCA_WLAN_VENDOR_ATTR_SETBAND_MASK.
+ *
  */
 
 enum qca_nl80211_vendor_subcmds {
@@ -656,6 +661,7 @@ enum qca_nl80211_vendor_subcmds {
 	QCA_NL80211_VENDOR_SUBCMD_DRIVER_DISCONNECT_REASON = 189,
 	QCA_NL80211_VENDOR_SUBCMD_CONFIG_TSPEC = 190,
 	QCA_NL80211_VENDOR_SUBCMD_CONFIG_TWT = 191,
+	QCA_NL80211_VENDOR_SUBCMD_GETBAND = 192,
 };
 
 enum qca_wlan_vendor_tos {