qcacmn: Add supporting functions for extended capabilities IE

Add structures and supporting function get bit field value of extended
capabilities IE bit field.

Change-Id: Iff915320d71473310e2cbc0188508061b14a40f1
CRs-Fixed: 2296592

umac/cmn_services/cmn_defs/inc/wlan_cmn_ieee80211.h

@@ -1088,6 +1088,18 @@ struct wlan_esp_ie {
 	struct wlan_esp_info esp_info_AC_VO;
 } qdf_packed;
 
+/**
+ * struct wlan_ext_cap_ie - struct for extended capabilities information
+ * @ext_cap_id: Extended capabilities id
+ * @ext_cap_len: Extended capabilities IE len
+ * @ext_caps: Variable length extended capabilities information
+ */
+struct wlan_ext_cap_ie {
+	uint8_t ext_cap_id;
+	uint8_t ext_cap_len;
+	uint8_t ext_caps[];
+} qdf_packed;
+
 /**
  * struct oce_reduced_wan_metrics: struct for oce wan metrics
  * @downlink_av_cap: Download available capacity