qcacld-2.0: Add lost AP sample size entry to nla policy

Incorrect validation of
QCA_WLAN_VENDOR_ATTR_EXTSCAN_BSSID_HOTLIST_PARAMS_LOST_AP_SAMPLE_SIZE
results in assigning an unchecked user-controller value.
This can lead to buffer overflow.

validate 
  QCA_WLAN_VENDOR_ATTR_EXTSCAN_BSSID_HOTLIST_PARAMS_LOST_AP_SAMPLE_SIZE.

CRs-Fixed: 2045470
Change-Id: I7c33b6d78054672e9effbe9100c29e5604c250c6
Bug: 36818198
Signed-off-by: Srinivas Girigowda <sgirigow@codeaurora.org>

drivers/staging/qcacld-2.0/CORE/HDD/src/wlan_hdd_cfg80211.c

@@ -850,6 +850,7 @@ wlan_hdd_extscan_config_policy[QCA_WLAN_VENDOR_ATTR_EXTSCAN_SUBCMD_CONFIG_PARAM_
     [QCA_WLAN_VENDOR_ATTR_EXTSCAN_SSID_THRESHOLD_PARAM_RSSI_LOW] = { .type = NLA_S32 },
     [QCA_WLAN_VENDOR_ATTR_EXTSCAN_SSID_THRESHOLD_PARAM_RSSI_HIGH] = { .type = NLA_S32 },
     [QCA_WLAN_VENDOR_ATTR_EXTSCAN_CONFIGURATION_FLAGS] = { .type = NLA_U32 },
+    [QCA_WLAN_VENDOR_ATTR_EXTSCAN_BSSID_HOTLIST_PARAMS_LOST_AP_SAMPLE_SIZE] = { .type = NLA_U32 },
 };
 static const struct nla_policy