net: wireless: bcmdhd: fix hotlist index in wl_cfgvendor_hotlist_cfg

add bssid count element to exactly refer in NL-TLV parsing.

This change need to sync with
/hardware/broadcom/wlan/bcmdhd/wifi_hal/gscan.cpp
where GSCAN_ATTRIBUTE_HOTLIST_BSSID_COUNT supposed to be called.

Bug: 32474971

Signed-off-by: Insun Song <insun.song@broadcom.com>
Change-Id: Id2b019bb43fb99b3843fe1b32f59e58c7af7cdad