qcacld-3.0: Add a check to set band as auto

Currently in driver when value is set as QCA_SETBAND_AUTO for
QCA_WLAN_VENDOR_ATTR_SETBAND_MASK attr in QCA_NL80211_VENDOR_SUBCMD_SETBAND
command, it return invalid argument error instead of enabling all supported
bands.

To resolve the above issue add a check for the value QCA_SETBAND_AUTO and
if it is true enable all the supported bands.

Change-Id: I0f4f03b8e2e049cc253822582436fd1fabf65133
CRs-Fixed: 2819677

core/hdd/src/wlan_hdd_cfg80211.c

@@ -12511,6 +12511,8 @@ wlan_vendor_bitmap_to_reg_wifi_band_bitmap(uint32_t vendor_bitmap)
 {
 	uint32_t reg_bitmap = 0;
 
+	if (vendor_bitmap == QCA_SETBAND_AUTO)
+		reg_bitmap |= REG_BAND_MASK_ALL;
 	if (vendor_bitmap & QCA_SETBAND_2G)
 		reg_bitmap |= BIT(REG_BAND_2G);
 	if (vendor_bitmap & QCA_SETBAND_5G)